Preserve timestamps when installing data files

---
 Makefile.rules | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile.rules b/Makefile.rules
index f0c542b..0ff92bb 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -773,7 +773,7 @@ BCCompile.CXX = $(LLVMCXX) $(CPP.Flags) $(CXX.Flags) $(CXXFLAGS) $(CPPFLAGS) \
 
 ProgInstall   = $(INSTALL) $(Install.StripFlag) -m 0755
 ScriptInstall = $(INSTALL) -m 0755
-DataInstall   = $(INSTALL) -m 0644
+DataInstall   = $(INSTALL) -p -m 0644
 
 # When compiling under Mingw/Cygwin, the tblgen tool expects Windows
 # paths. In this case, the SYSPATH function (defined in
-- 
1.8.3.1