[patch] sdldoom & hexen international keyboard

Under my German keyboard the ‘=’ is only available via a Shift
key-sequence (and hence won’t work under doom), so I’ve added
support for ‘+’ to increase the window as well.

Ditto for hexen.

Markus

---- Markus F.X.J. Oberhumer <@Markus_F.X.J_Oberhum> ----
---- http://wildsau.idv.uni-linz.ac.at/mfx/ ----
---- 5E CB 5C 85 DE AF 9E BF E9 DA 7E 6A 39 F8 CC 67 ----

                         3 WARPS TO URANUS

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