mesa: Fix missing developLibDir symlink

sys-libs/mesa/mesa-10.0.1.recipe

@@ -9,7 +9,7 @@ COPYRIGHT="1999-2013 Brian Paul All Rights Reserved."
 LICENSE="MIT"
 SRC_URI="ftp://ftp.freedesktop.org/pub/mesa/10.0.1/MesaLib-10.0.1.tar.bz2"
 CHECKSUM_MD5="0a72ca5b36046a658bf6038326ff32ed"
-REVISION="1"
+REVISION="2"
 ARCHITECTURES="x86 x86_64"
 if [ $effectiveTargetArchitecture != x86_gcc2 ]; then
 	# x86_gcc2 is fine as primary target architecture as long as we're building
@@ -65,6 +65,8 @@ INSTALL()
 	# libGL.so makes up the core of our OpenGL kit
 	mkdir -p $libDir
 	cp $(find $mesaBuildDir -name 'libGL.so') $libDir
+	mkdir -p $developLibDir
+	symlinkRelative -s $libDir/libGL.so $developLibDir
 
 	# Our rendering add-ons
 	mkdir -p $addOnsDir/opengl