build: Fix building with the gold linker by referencing gmodule-2.0
build: Fix building with the gold linker by referencing gmodule-2.0

With the binutils-gold linker the '--no-copy-dt-needed-entries' flag is
active by default and using any symbol from indirectly loaded libraries
will result in undefined reference errors.

Add to the libfarstream target the AG_GST_GLIB_CHECK-generated GLIB_LIBS
variable, which references gmodule-no-export-2.0.

https://bugs.freedesktop.org/show_bug.cgi?id=61268

kakaroto/farstream,pexip/farstream,tieto/farstream,tieto/farstream,tieto/farstream,pexip/farstream,pexip/farstream,tieto/farstream,kakaroto/farstream,kakaroto/farstream,tieto/farstream,pexip/farstream,kakaroto/farstream