Ensure that the MAX macro is always defined.
Ensure that the MAX macro is always defined.

On some systems, none of the (directly or indirectly) included headers does
provide that macro. First reported in https://bugs.gentoo.org/460524

panaschieren/mumble-test,austinliou/mumble,unascribed/mumble,SuperNascher/mumble,Keridos/mumble,austinliou/mumble,LuAPi/mumble,LuAPi/mumble,Lartza/mumble,SuperNascher/mumble,Natenom/mumble,bheart/mumble,LuAPi/mumble,Natenom/mumble,unascribed/mumble,mbax/mumble,unascribed/mumble,bheart/mumble,ccpgames/mumble,LuAPi/mumble,Natenom/mumble,richard227/mumble,austinliou/mumble,Lartza/mumble,panaschieren/mumble-test,niko20010/mumble,Githlar/mumble,ccpgames/mumble,LuAPi/mumble,niko20010/mumble,Zopieux/mumble,SuperNascher/mumble,niko20010/mumble,austinliou/mumble,unascribed/mumble,Keridos/mumble,feld/mumble,Keridos/mumble,feld/mumble,Githlar/mumble,feld/mumble,richard227/mumble,Githlar/mumble,richard227/mumble,panaschieren/mumble-test,unascribed/mumble,niko20010/mumble,Natenom/mumble,mbax/mumble,Zopieux/mumble,SuperNascher/mumble,SuperNascher/mumble,LuAPi/mumble,Natenom/mumble,LuAPi/mumble,austinliou/mumble,mbax/mumble,unascribed/mumble,ccpgames/mumble,niko20010/mumble,Githlar/mumble,panaschieren/mumble-test,bheart/mumble,feld/mumble,bheart/mumble,niko20010/mumble,Natenom/mumble,Zopieux/mumble,Natenom/mumble,mbax/mumble,SuperNascher/mumble,Keridos/mumble,Keridos/mumble,Keridos/mumble,austinliou/mumble,niko20010/mumble,Natenom/mumble,unascribed/mumble,SuperNascher/mumble,SuperNascher/mumble,LuAPi/mumble,Keridos/mumble,Githlar/mumble,bheart/mumble,SuperNascher/mumble,unascribed/mumble,feld/mumble,richard227/mumble,ccpgames/mumble,panaschieren/mumble-test,richard227/mumble,Keridos/mumble,ccpgames/mumble,richard227/mumble,Githlar/mumble,Zopieux/mumble,Lartza/mumble,bheart/mumble,Zopieux/mumble,bheart/mumble,bheart/mumble,panaschieren/mumble-test,Zopieux/mumble,Lartza/mumble,Lartza/mumble,Zopieux/mumble,panaschieren/mumble-test,austinliou/mumble,feld/mumble,richard227/mumble,panaschieren/mumble-test,austinliou/mumble,ccpgames/mumble,ccpgames/mumble,niko20010/mumble,feld/mumble,Lartza/mumble,richard227/mumble,mbax/mumble,ccpgames/mumble,Lartza/mumble,LuAPi/mumble,mbax/mumble,feld/mumble,mbax/mumble,mbax/mumble,Lartza/mumble,Githlar/mumble,Zopieux/mumble,Githlar/mumble