Don't search for libspeex on Windows and Mac.

Make sure to not try to dynamically link libspeex on Mac, since it's not a
standard library, and application bundles aren't statically linked anyway.
Remove looking up libspeex on Windows since it's not a standard library there
either. Don't search for libspeex multiple times but instead pass it to the
librbspeex Makefile.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27999 a1c6a512-1295-4272-9138-f99709370657
2 files changed