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.
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