New function(s): strnmatch() and strmatch()

These two functions look for a string in a (terminate) list of strings
and returns the index to that string, or -1 if not found or error.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/Makefile.am

@@ -14,6 +14,7 @@ libite_la_SOURCES     = chomp.c		copyfile.c			\
 			reallocarray.c	rsync.c				\
 			strlcpy.c 	strlcat.c 	strtonum.c	\
 			strdupa.h	strndupa.h	strnlen.h	\
+			strmatch.c					\
 			tempfile.c	which.c				\
 			lite.h		strlite.h			\
 			queue.h		tree.h