Update autoreconf USES to run intltoolize if needed.

[kwm]

Summary

A number of gnome ports use intltool for the po files, intltoolize will copy a Makefile.in.in file to the po directory when run. And is normaly run from the autogen.sh, but since autoreconf.mk doesn't.

http://stackoverflow.com/questions/10366852/autogen-sh-does-not-regenerate-po-makefile-in-in

Example: https://github.com/hughsie/appdata-tools/blob/master/autogen.sh

[kwm]

replace PORT_OPTIONS with USE_GNOME so we test the correct thing.

[tijl]

See https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194393

Mk/Uses/autoreconf.mk

+Hide the scary c11 features from c2hs, which does not understand them:
+
+c2hs: C header contains errors:
+/usr/include/sys/_types.h:104: (column 61) [ERROR]  >>> Syntax error !
+  The symbol `long' does not fit here.
+*** Error code 1
+
+--- c2hs/toplevel/C2HSConfig.hs.orig    2017-03-21 18:17:37 UTC
++++ c2hs/toplevel/C2HSConfig.hs
+@@ -64,14 +64,17 @@ cpp  = case os of
+ -- * `-x c' forces CPP to regard the input as C code; this option seems to be
+ --   understood at least on Linux, FreeBSD, and Solaris and seems to make a
+ --   difference over the default language setting on FreeBSD
++--
++-- * Pass -std=c99 as c2hs get's confused by the c11 parts in the FreeBSD
++--   system headers.
+ --
+ -- * `-P' would suppress `#line' directives
+ --
+ cppopts :: [String]
+ cppopts  = case (os,cpp) of
+   ("openbsd","cpp") -> ["-xc", "-w"]
+-  (_,"cpp")         -> ["-x", "c", "-w"]
+-  (_,"gcc")         -> ["-E", "-x", "c", "-w"]
++  (_,"cpp")         -> ["-x", "c", "-w", "-std=c99"]
++  (_,"gcc")         -> ["-E", "-x", "c", "-w", "-std=c99"]
+   _                 -> []
+
+ -- C preprocessor option for including only definitions (EXPORTED)