new drivers/Makefile with simple default/clean/install rules

src/mesa/drivers/Makefile

@@ -0,0 +1,29 @@
+# src/mesa/drivers/Makefile
+
+TOP = ../../..
+include $(TOP)/configs/current
+
+
+default:
+	@for dir in $(DRIVER_DIRS) ; do \
+		if [ -d $$dir ] ; then \
+			(cd $$dir && $(MAKE)) || exit 1; \
+		fi \
+	done
+
+
+clean:
+	@for dir in $(DRIVER_DIRS) ; do \
+		if [ -d $$dir ] ; then \
+			(cd $$dir && $(MAKE) clean) || exit 1; \
+		fi \
+	done
+
+
+install:
+	@for dir in $(DRIVER_DIRS) ; do \
+		if [ -d $$dir ] ; then \
+			(cd $$dir && $(MAKE) install) || exit 1; \
+		fi \
+	done
+