use .so not .dylib for modules on OS-X, fix for MODENDP-16

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5573 d0543943-73ff-0310-b7d9-9358b9ac24b2

configure.in

@@ -106,9 +106,6 @@ fi
 # set DYNAMIC_LIB_EXTEN
 # we should really be using libtool so we don't need to do this
 case "$host" in
-    *darwin*)
-        DYNAMIC_LIB_EXTEN="dylib"
-    ;;
     *cygwin* | *mingw*)
         DYNAMIC_LIB_EXTEN="dll"
     ;;