Fix compiler warnings from XCode 5.0 on OSX.

Fix compiler warnings from XCode 5.0 on OSX.

* nsterm.m (setMarkedText:selectedRange:):
(deleteWorkingText):
* nsmenu.m (addDisplayItemWithImage:idx:tag:helpText:enabled:):
* nsfont.m (ns_get_covering_families, ns_findfonts): Cast NSLog
argument to unsigned long to avoid warning.
(nsfont_draw): Use 0.25 instead of  Fix2X (kATSItalicQDSkew).

* process.c (wait_reading_process_output): Change int pnamelen to
socklen_t.