library's soname. Split Makefile.common out from Makefile in preparation
for the addition of the mpg123 program and output module packages.
Change buildlink3.mk to reflect this, and rename options.mk
to mpg123-options.mk in adherence with convention, e.g.
gecko-options.mk.
core decoder library, which the new mpg123 package will depend on.
Other software packages are beginning to write plug-ins for this
library, and so installing it seperately is worthwhile.
NOTE: I have encountered segfaults when attempting to use the jack
module, which is threaded, with mpg123 unless I linked mpg123 with
libpthread. This may or may not apply to the library, though my
intuition is that it does not, as obviously the executable is
what calls lt_dlopen(). Thus, for now the Makefile and b3.mk of the
executable will pull in dlopen.buildlink3.mk, setting
DLOPEN_REQUIRE_PTHREADS=yes as necessary (last time I checked on
NetBSD 4.99, it was).
