(stmp-fixproto): Never run fixproto twice.

From-SVN: r6125

gcc/Makefile.in

@@ -1614,10 +1614,16 @@ fixhdr.ready: fix-header
 	fi
 
 # stmp-headers is to make sure fixincludes has already finished.
+# The if statement is so that we don't run fixproto a second time
+# if it has already been run on the files in `include'.
 stmp-fixproto: fixhdr.ready fixproto stmp-headers
 	@echo "Various warnings and error messages from fixproto are normal"
-	CPP="$(GCC_FOR_TARGET) -E"; export CPP; \
-	  ${srcdir}/fixproto include include $(SYSTEM_HEADER_DIR)
+	if [ -f include/fixed ] ; then true; \
+	else \
+	  CPP="$(GCC_FOR_TARGET) -E"; export CPP; \
+	    ${srcdir}/fixproto include include $(SYSTEM_HEADER_DIR); \
+	  touch include/fixed; \
+	fi
 	touch stmp-fixproto
 
 # Remake the info files.