[bazel] Sync llvm-config.h.cmake after a1862d7

Author: d0k

utils/bazel/llvm_configs/llvm-config.h.cmake

@@ -109,4 +109,7 @@
 /* Define if building LLVM with BUILD_SHARED_LIBS */
 #cmakedefine LLVM_BUILD_SHARED_LIBS
 
+/* Define if building LLVM with LLVM_FORCE_USE_OLD_TOOLCHAIN_LIBS */
+#cmakedefine LLVM_FORCE_USE_OLD_TOOLCHAIN $(LLVM_FORCE_USE_OLD_TOOLCHAIN)
+
 #endif