Removed unsupported flag from clang CROSSTOOL.

Change-Id: I2c76399a41399dd3396771065a00d384b145126c
diff --git a/tools/cpp/CROSSTOOL b/tools/cpp/CROSSTOOL
index 31f3633..f874fce 100644
--- a/tools/cpp/CROSSTOOL
+++ b/tools/cpp/CROSSTOOL
@@ -241,9 +241,6 @@
   # Don't use temp files while compiling.
   compiler_flag: "-pipe"
 
-  # Have GCC return the exit code from ld.
-  linker_flag: "-pass-exit-codes"
-
   # Stamp the binary with a unique identifier.
   linker_flag: "-Wl,--build-id=md5"
   linker_flag: "-Wl,--hash-style=gnu"