build: yy_src_dir and yy_build_dir can be simply expanded.

Simply expanded variables should be preferred whenever possible since
they are more intuitive and a bit faster.

diff --git a/Makefile.real b/Makefile.real
index bd2bd9d95fe8356f09e756268340f2f4cad52706..42ff86269faea344ae961a2e7d6b4e928c8e1d49 100644 (file)
--- a/Makefile.real
+++ b/Makefile.real
@@ -35,8 +35,8 @@ m4depdir := $(build_dir)/m4deps
 lls_suite_dir := $(build_dir)/lls
 lls_m4_dir := m4/lls
 test_dir := t
-yy_src_dir = yy
-yy_build_dir = $(build_dir)/yy
+yy_src_dir := yy
+yy_build_dir := $(build_dir)/yy
 
 # sort removes duplicate words, which is all we need here
 all_objs := $(sort $(recv_objs) $(filter_objs) $(client_objs) $(gui_objs) \