Add a patch to explicitly link against libfplib.so.

What the port was doing was never right, but the upcoming CMake 3.5.0 makes the
build failures happen more often.

Using target_link_libraries() with a name like fplib will just pass -lfplib to
the linker instead of declaring a dependency between the lastfm-fpclient and
fplib_shared targets and parallel builds may break.

PR:		208033

audio/fplib/files/patch-CMakeLists.txt

@@ -0,0 +1,15 @@
+Link against an actual target name, not the generated library name.
+
+If we link against the latter, there is no dependency between lastfm-fpclient
+and fplib, which can break parallel builds starting with CMake 3.5.0.
+--- CMakeLists.txt.orig	2016-03-16 09:53:03 UTC
++++ CMakeLists.txt
+@@ -139,7 +139,7 @@ ADD_EXECUTABLE(lastfm-fpclient
+ 
+ # Link the executable
+ TARGET_LINK_LIBRARIES(lastfm-fpclient
+-   fplib
++   fplib_shared
+    fftw3f
+    mad
+    tag