For PR351:
Make LLVM_ON_UNIX and LLVM_ON_WIN32 available in the makefiles


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19205 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile.config.in b/Makefile.config.in
index ee77f87..a1983ab 100644
--- a/Makefile.config.in
+++ b/Makefile.config.in
@@ -27,6 +27,10 @@
 LLVM_CONFIGTIME   := @LLVM_CONFIGTIME@
 LLVM_TARBALL_NAME := @PACKAGE_NAME@-@PACKAGE_VERSION@
 
+# Determine if we're on a unix type operating system
+LLVM_ON_UNIX:=@LLVM_ON_UNIX@
+LLVM_ON_WIN32:=@LLVM_ON_WIN32@
+
 # Target operating system for which LLVM will be compiled.
 OS=@OS@