[Bug 251688] mail/opendkim: Fix build with lua > 5.3

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251688

            Bug ID: 251688
           Summary: mail/opendkim: Fix build with lua > 5.3
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: dim at FreeBSD.org
                CC: freebsd-ports at dan.me.uk
                CC: freebsd-ports at dan.me.uk
             Flags: maintainer-feedback?(freebsd-ports at dan.me.uk)

Created attachment 220370
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=220370&action=edit
Fix lua version check in mail/opendkim

Attempting to build mail/opendkim 2.10.3_11 with lua 5.4 installed (i.e. with
DEFAULT_VERSIONS+=lua=5.4 in make.conf) leads to warnings and errors:

...
Making all in miltertest
cc -DHAVE_CONFIG_H -I. -I..  -I./../libopendkim -I/usr/include
-I/usr/local/include/lua54 -DCONFIG_BASE=\"/usr/local/etc\"  -O2 -pipe
-march=haswell  -fstack-protector-strong -fno-strict-aliasing -MT
miltertest-miltertest.o -MD -MP -MF .deps/miltertest-miltertest.Tpo -c -o
miltertest-miltertest.o `test -f 'miltertest.c' || echo './'`miltertest.c
miltertest.c:4016:2: warning: implicit declaration of function 'luaL_register'
is invalid in C99 [-Wimplicit-function-declaration]
        luaL_register(l, "mt", mt_library);
        ^
miltertest.c:4171:54: error: too few arguments to function call, expected 5,
have 4
                         script == NULL ? "(stdin)" : script))
                                                            ^
/usr/local/include/lua54/lua.h:289:1: note: 'lua_load' declared here
LUA_API int   (lua_load) (lua_State *L, lua_Reader reader, void *dt,
^
/usr/local/include/lua54/luaconf.h:292:18: note: expanded from macro 'LUA_API'
#define LUA_API         extern
                        ^
1 warning and 1 error generated.
*** Error code 1

This is because ports r488837 changed the #if statements in this file, but
didn't use >= to check for any version of lua >= 5.2.

Attached patch will make it all work for a while, until lua messes up their API
again.

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