broadcom/vc5: Add missing include paths.

Fixes: 954a704da3 ("broadcom/vc5: Port the RCL setup to V3D4.1.")
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Eric Anholt <eric@anholt.net>

src/gallium/drivers/vc5/Makefile.am

@@ -38,10 +38,10 @@ noinst_LTLIBRARIES = \
 	$()
 
 libvc5_v33_la_SOURCES = $(VC5_PER_VERSION_SOURCES)
-libvc5_v33_la_CFLAGS = -DV3D_VERSION=33
+libvc5_v33_la_CFLAGS = $(AM_CFLAGS) -DV3D_VERSION=33
 
 libvc5_v41_la_SOURCES = $(VC5_PER_VERSION_SOURCES)
-libvc5_v41_la_CFLAGS = -DV3D_VERSION=41
+libvc5_v41_la_CFLAGS = $(AM_CFLAGS) -DV3D_VERSION=41
 
 libvc5_la_SOURCES = $(C_SOURCES)