enable shared libs on m68k

patch by Kolbjørn Barmen

http://bugs.gentoo.org/113807

--- Configure
+++ Configure
@@ -407,1 +407,1 @@
-"linux-m68k",   "gcc:-DB_ENDIAN -DTERMIO -O2 -fomit-frame-pointer -Wall::-D_REENTRANT:::BN_LLONG::",
+"linux-m68k",   "gcc:-DB_ENDIAN -DTERMIO -O2 -Wall::-D_REENTRANT::-ldl:BN_LLONG MD2_CHAR RC4_INDEX::::::::::dlfcn:linux-shared:-fPIC::.so.\$(SHLIB_MAJOR).\$(SHLIB_MINOR)",