[gn] port 8cde1cf (LLVM_APPEND_VC_REV for lit)

Author: nico

llvm/utils/gn/secondary/llvm/test/BUILD.gn

@@ -59,9 +59,11 @@ write_lit_config("lit_site_cfg") {
     # LLVM_HOST_TRIPLE.)
     "HOST_LDFLAGS=",
 
+    "LLVM_APPEND_VC_REV=0",
     "LLVM_ENABLE_FFI=0",
     "LLVM_ENABLE_HTTPLIB=0",
     "LLVM_ENABLE_ZSTD=0",
+    "LLVM_FORCE_VC_REVISION=",
     "LLVM_HAVE_OPT_VIEWER_MODULES=0",
     "LLVM_HOST_TRIPLE=$llvm_current_triple",
     "LLVM_INCLUDE_DXIL_TESTS=0",