make(1): reduce amount of work in test job-output-long-lines.mk

The effect that some of the separator lines start at the end of another
line is still visible.

make(1): use consistent indentation in variable assignments

Initial work by "pkglint -F *.mk", manually adjusted in a few places.

make(1): fix test job-output-long-lines

The test failed on Linux since the test relied on the two child
processes interleaving each other. This is not guaranteed to happen
though.

make(1): add test for merging long lines of job output

make(1): use consistent indentation in variable assignments

Initial work by "pkglint -F *.mk", manually adjusted in a few places.

make(1): fix test job-output-long-lines

The test failed on Linux since the test relied on the two child
processes interleaving each other. This is not guaranteed to happen
though.

make(1): add test for merging long lines of job output

make(1): fix test job-output-long-lines

The test failed on Linux since the test relied on the two child
processes interleaving each other. This is not guaranteed to happen
though.

make(1): add test for merging long lines of job output