Readme.Compiling.md: Mention the need for zstd and python3

Change-Id: I9d787e3e79a6da419e6d08496463df493026e720

Readme.Compiling.md: Use new build profiles

When #15963 was fixed, some build profiles were succeeded by newer
ones, while the older ones were completely removed. However, this
document was never updated to specifically reflect this change.

Additionally, some headers were slightly improved to make them more
descriptive.

Change-Id: If89e927bef3b87df4e54eecb13a69d877b90e6af
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6001
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

Added missing --cross-tools-source argument name for bootstrap build and missing \ at the end of line 136

Change-Id: Ie4a6d47d78a1f2eb707c15a53335adee7e370376
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4745
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

Update build packages repository

- Switch to Python3
- Switch to mawk instead of gawk
- Update ffmpeg (there are several new dependencies)
- Update ICU
- Fix various pre-existing problems with packages not being properly
declared for gcc2 (but somehow it ended up working)
- remove curl, subversion, mercurial

Confirmed that both nightly and release images are building fine on both
32 and 64bit. However, non-x86 architecture may require re-bootstrapping
to do a complete nightly or release image build (the minimal profile
should be fine)

Fixes #16751.

Change-Id: Iacac92923c4113b3e0a49a64b0b4cc1b8e2f5e2e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3871
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

Updated Readme.Compiling.md according to hrev54611

Updated commands to compile build tools

fixes #16566

Change-Id: I3ef4d253dc45e0bb92e4c13164c7fac2127a5a94
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3495
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

Update readme.compiling

- Clarify why building jam is not needed on Haiku
- Put the 64bit instuctions first, as they apply to both Haiku and other
platforms and are the way to go for people discovering Haiku, usually
(only oldtimers will care about BeOS compatibility)
- Remove the "from non-haiku platforms" from 64bit instructions because
they work just fine on Haiku as well

ReadMe.Compiling: Various updates.

* Remove parenthetical about cross-tools not being needed on Haiku,
as they are indeed on x86_64.
* Replace mkisofs/genisoimage with xorriso.
* Move mtools to the list of tools generally needed, as EFI builds
require them.
* Update clone URLs and GCC version numbers.

BuildFeatures: Remove curl buildfeature.

No longer used.

Change-Id: I3a97e18e76da0995f9ab8599b796144c5bc0452c
Reviewed-on: https://review.haiku-os.org/606
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

build: Cleanup of libgnuregex usage.

John's revert of my removal commit dragged back a bunch of cygwin/sunos
cruft, as well as re-adding RegExp.cpp to the host libshared, that we don't
need.

Instead, remove this and add libgnuregex_build to just the tools/keymap
link alongside the FreeBSD gnuregex case.

ReadMe.compiling.md: Add quick lesson on bootstrap in-tree

Change-Id: I416a2e96adc6f34609c3f6ca1aadf892d29c7fd7

Revert "build/libgnuregex: Remove."

This reverts commit ca087b05323d3c05f7fe807df017ce4133604b67.

Mac OS X requires libgnuregex for Keymap

build/libgnuregex: Remove.

It was needed on macOS for a time when BUrl used regexes for parsing.
Now it does not, and so we can remove libshared's RegExp from build
libshared, and thus also libgnuregex.

configure: Enable use-xattr or use-xattr-ref automatically.

The previous commit only checked that they worked if the user
enabled them, but now they will be enabled automatically if the
underlying filesystem supports them.

The ReadMe.Compiling has been updated accordingly.

ReadMe.Compiling: We can work with genisoimage now.

(This commit brought to you by Finicky Buildbots In Need of Kicking.)

Added hint to have an updated "bison" for compiling on OS X

ReadMe.Compiling: specify Bison 2.4 as the minimum.

This is the version that comes with Haiku. According to John Scipione,
2.3 doesn't work, so this must be the minimum.

ReadMe.Compiling: rework to Markdown, cleanup links.

There are still probably issues with the walkthroughs in here,
but I don't cross-compile Haiku very often so someone else should
fix those.

ReadMe.Compiling: specify Bison 2.4 as the minimum.

This is the version that comes with Haiku. According to John Scipione,
2.3 doesn't work, so this must be the minimum.

ReadMe.Compiling: rework to Markdown, cleanup links.

There are still probably issues with the walkthroughs in here,
but I don't cross-compile Haiku very often so someone else should
fix those.