Some new warnings at compilation time

[Atcold]

/tmp/luarocks_paths-scm-1-4305/paths/paths.c: In function 'lua_tmpname':
/tmp/luarocks_paths-scm-1-4305/paths/paths.c:747:3: warning: 'tempnam' is deprecated: This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of tempnam(3), it is highly recommended that you use mkstemp(3) instead. [-Wdeprecated-declarations]
   char *tmp = tempnam(NULL, "luatmp");
   ^
In file included from /usr/local/include/lauxlib.h:13:0,
                 from /tmp/luarocks_paths-scm-1-4305/paths/build/paths.h:4,
                 from /tmp/luarocks_paths-scm-1-4305/paths/paths.c:4:
/usr/include/stdio.h:391:7: note: declared here
 char *tempnam(const char *, const char *) __DARWIN_ALIAS(tempnam);
       ^