Simplify SLIBNAME_WITH_VERSION and SLIBNAME_WITH_MAJOR.

Originally committed as revision 5388 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -244,8 +244,8 @@ LIB='$(LIBPREF)$(NAME)$(LIBSUF)'
 SLIBPREF="lib"
 SLIBSUF=".so"
 SLIBNAME='$(SLIBPREF)$(NAME)$(SLIBSUF)'
-SLIBNAME_WITH_VERSION='$(SLIBPREF)$(NAME)$(SLIBSUF).$(LIBVERSION)'
-SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(NAME)$(SLIBSUF).$(LIBMAJOR)'
+SLIBNAME_WITH_VERSION='$(SLIBNAME).$(LIBVERSION)'
+SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
 EXESUF=""
 BUILDSUF=""
 amr_nb="no"