Added extra space to end of EXTRA_FLAGS in buildit. This fixes http://llvm.org/bugs/show_bug.cgi?id=15761

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@179609 91177308-0d34-0410-b5e6-96231b3b80d8

lib/buildit

@@ -37,7 +37,7 @@ fi
 
 EXTRA_FLAGS="-std=c++0x -fstrict-aliasing -Wall -Wextra -Wshadow -Wconversion \
              -Wnewline-eof -Wpadded -Wmissing-prototypes -Wstrict-aliasing=2 \
-             -Wstrict-overflow=4"
+             -Wstrict-overflow=4 "
 
 case $TRIPLE in
   *-apple-*)