configs: set INTEL_LIBS, INTEL_CFLAGS, etc

configs/linux-dri

@@ -65,3 +65,9 @@ GALLIUM_STATE_TRACKERS_DIRS = egl
 
 DRI_DIRS = i810 i915 i965 mach64 mga r128 r200 r300 radeon \
 	savage sis tdfx unichrome ffb swrast
+
+INTEL_LIBS = `pkg-config --libs libdrm_intel`
+INTEL_CFLAGS = `pkg-config --cflags libdrm_intel`
+
+RADEON_LIBS = `pkg-config --libs libdrm_radeon`
+RADEON_CFLAGS = `pkg-config --cflags libdrm_radeon`