sync code with last improvements from OpenBSD

lib/mesa/mk/libglcpp/Makefile

@@ -0,0 +1,32 @@
+#	$OpenBSD: Makefile,v 1.2 2022/09/02 05:46:38 jsg Exp $
+
+LIB=	glcpp
+
+NOPROFILE=
+
+SRCS=	glcpp-lex.c \
+	glcpp-parse.c \
+	pp.c
+
+.include "../Makefile.inc"
+
+CFLAGS+=	${C_VIS_ARGS} ${NO_OVERRIDE_INIT_ARGS}
+CXXFLAGS+=	${CXX_VIS_FLAGS}
+CPPFLAGS+=	-I${MESA_SRC}/src/compiler/glsl/glcpp \
+		-I${MESA_SRC}/src/mesa \
+		-I${MESA_SRC}/src/mapi \
+		-I${MESA_SRC}/src/gallium/include \
+		-I${MESA_SRC}/generated/src/compiler/glsl/glcpp
+
+install:
+
+obj: _xenocara_obj
+
+.include <bsd.lib.mk>
+.include <bsd.xorg.mk>
+
+.PATH:	${MESA_SRC}/src/compiler/glsl/glcpp
+.PATH:	${MESA_SRC}/generated/src/compiler/glsl/glcpp
+
+.SUFFIXES:
+.SUFFIXES: .o .c