Fix inconsistent /usr/local/{include,lib} search

In particular, we were adding -L/usr/local/lib which means it is considered
before built-in directories (/usr/lib, etc) but in our own library search
code we were considering it after (because we were storing it at the end of
sys_lib_dirs).

Now in both sys_{hdr,lib}_dirs we store /usr/local/{include,lib} after mode
and before built-in directories. Note that as part of this fix we now pass
-isystem /usr/local/include instead of -idirafter (which is consistent with
the -L behavior and also the customarily expected semantics).

0 files changed, 0 insertions, 0 deletions