Remove malloc.m4, pathmax.m4, realloc.m4.

m4/.cvsignore

@@ -50,7 +50,6 @@ lib-prefix.m4
 localcharset.m4
 longdouble.m4
 longlong.m4
-malloc.m4
 mbrtowc.m4
 mbstate_t.m4
 mempcpy.m4
@@ -60,13 +59,11 @@ modechange.m4
 nls.m4
 obstack.m4
 onceonly.m4
-pathmax.m4
 po.m4
 printf-posix.m4
 progtest.m4
 quote.m4
 quotearg.m4
-realloc.m4
 restrict.m4
 rmdir.m4
 rmt.m4