buildit adjustment

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@109931 91177308-0d34-0410-b5e6-96231b3b80d8

lib/buildit

@@ -21,7 +21,7 @@ case $TRIPLE in
   *-apple-*)
     if [ -z $RC_BUILDIT ]
     then
-      RC_CFLAGS="-arch i386 -arch ppc -arch x86_64"
+      RC_CFLAGS="-arch i386 -arch x86_64"
     fi
     SOEXT=dylib
     LDSHARED_FLAGS="-o libc++.1.dylib \