Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Mark csu on PowerPC as not requiring executable stack.

Reviewed and tested by: nwhitehorn

Let all .c and .S files under lib/csu consistently use the __FBSDID()
macro for identification, instead of several different hand-rolled
variants (plain .ident, .ascii, etc).

C startup support for 64-bit PowerPC.

Obtained from: projects/ppc64

Use .rodata section for $FreeBSD$.

PowerPC verions of the crt initialization and finalization files required
by the ELF ABI.