Add two patches to textproc/intltool so it works better with USES=autoreconf

• Patch intltool.m4 so translations are always installed in PREFIX/share/locale instead of PREFIX/lib/locale (USE_GNOME=intlhack also does this for ports without USES=autoreconf)
• Patch intltoolize.in so it creates the directory where it will copy intltool.m4 into if it doesn't exist yet

Also remove old CONFIGURE_ARGS, CONFLICTS, post-patch and post-install
from Makefile and remove an old patch.

PR: 198123
Exp-run by: antoine
Approved by: gnome (kwm), portmgr (antoine)