This attempts to clean up the way various compatibility
functions are defined and used.

 - A new header file, git-compat-util.h, is introduced.  This
   looks at various NO_XXX and does necessary function name
   replacements, equivalent of -Dstrcasestr=gitstrcasestr in the
   Makefile.

 - Those function name replacements are removed from the Makefile.

 - Common features such as usage(), die(), xmalloc() are moved
   from cache.h to git-compat-util.h; cache.h includes
   git-compat-util.h itself.

Signed-off-by: Junio C Hamano <junkio@cox.net>

Some C libraries lack strcasestr(); add a stupid replacement
to help folks with such.

[jc: original Linus posting, updated with his "also need <ctype.h>",
 updated further with a fix from Joachim B Haga <cjhaga@fys.uio.no>"]

Signed-off-by: Junio C Hamano <junkio@cox.net>