Added pkg-config script for Linux. Issue #612.

scripts/bgfx.pc

@@ -0,0 +1,11 @@
+prefix=/usr/local
+exec_prefix=${prefix}
+includedir=${prefix}/include
+libdir=${exec_prefix}/lib
+
+Cflags: -I${includedir}
+Libs: -L${libdir} -lX11 -lGL -pthread -lrt -ldl
+
+Name: bgfx
+Description: Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.
+Version: 1.0.0