Use tabs instead of spaces.

No, really, make doesn't work with spaces.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151920 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/Makefile b/lib/Basic/Makefile
index f5ca904..fe2c515 100644
--- a/lib/Basic/Makefile
+++ b/lib/Basic/Makefile
@@ -33,8 +33,8 @@
          -DLLVM_REVISION='"$(LLVM_REVISION)"' -DLLVM_REPOSITORY='"$(LLVM_REPOSITORY)"'
 
 $(ObjDir)/.ver-svn .ver: $(ObjDir)/.dir
-        @if [ '$(SVN_REVISION) $(LLVM_REVISION)' != '$(shell cat $(ObjDir)/.ver-svn 2>/dev/null)' ]; then\
-                echo '$(SVN_REVISION) $(LLVM_REVISION)' > $(ObjDir)/.ver-svn;                    \
-        fi
+	@if [ '$(SVN_REVISION) $(LLVM_REVISION)' != '$(shell cat $(ObjDir)/.ver-svn 2>/dev/null)' ]; then\
+		echo '$(SVN_REVISION) $(LLVM_REVISION)' > $(ObjDir)/.ver-svn;                    \
+	fi
 $(ObjDir)/.ver-svn: .ver
 $(ObjDir)/Version.o: $(ObjDir)/.ver-svn