add DESTDIR support for TOOLALIAS, for PR6557, patch by
Matthias Klose!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98193 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile.rules b/Makefile.rules
index fcddd50..20e642a 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -1329,7 +1329,7 @@
 
 # TOOLALIAS install.
 ifdef TOOLALIAS
-DestToolAlias = $(PROJ_bindir)/$(TOOLALIAS)$(EXEEXT)
+DestToolAlias = $(DESTDIR)$(PROJ_bindir)/$(TOOLALIAS)$(EXEEXT)
 
 install-local:: $(DestToolAlias)