Bug 1066669 - Use a regex that OS X sed understands. Fixes configure failures when using --with-ccache=... rs=ted

configure.in

@@ -9137,7 +9137,7 @@ fi
 
 if test -n "$MOZ_USING_CCACHE"; then
     # Avoid double prepending ccache by omitting --with-ccache in building NSPR.
-    _SUBDIR_CONFIG_ARGS="`echo $_SUBDIR_CONFIG_ARGS | sed -e 's/--with-ccache\S* *//'`"
+    _SUBDIR_CONFIG_ARGS="`echo $_SUBDIR_CONFIG_ARGS | sed -e 's/--with-ccache[^ ]+//'`"
 fi
 
 MOZ_SUBCONFIGURE_NSPR()