Portability improvements

Portability improvements

Gschema-compile uses glob which is available on Unix only. Thus can't
run the gschema-compile test except on Unix either.

To avoid an Automake error, comment out the SOURCES and LDADD of
unix-streams which for some reason has been commented out from
TEST_PROGS.

Can't use a Makefile.am target called foo_PROGRAMS for random files
that aren't actually programs, as Automake assumes EXEEXT should be
appended to the file names.