libclang output name is now libclang. This solves a name collision

when building with Visual Studio. `clang.dll' and `clang.exe' would
have the same `clang.ilk' and `clang.pdb'. On a serial build those
files would be overwritten as clang.exe/clang.dll are created. On a
parallel build there is a risk of both files being written at the same
time. On that case VS fails.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@129239 91177308-0d34-0410-b5e6-96231b3b80d8

tools/libclang/CMakeLists.txt

@@ -33,7 +33,7 @@ if( LLVM_ENABLE_PIC )
 
   set_target_properties(libclang
     PROPERTIES
-    OUTPUT_NAME "clang"
+    OUTPUT_NAME "libclang"
     VERSION ${LIBCLANG_LIBRARY_VERSION}
     DEFINE_SYMBOL _CINDEX_LIB_)
 
@@ -64,5 +64,5 @@ if( NOT BUILD_SHARED_LIBS AND NOT WIN32 )
 
   set_target_properties(${LIBCLANG_STATIC_TARGET_NAME}
     PROPERTIES
-    OUTPUT_NAME "clang")
+    OUTPUT_NAME "libclang")
 endif()