configure: fix the wording for gpl incompatible licenses warnings

calling the 4 clause BSD license non free is quite a stretch ;)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -2853,6 +2853,10 @@ die_license_disabled() {
     enabled $1 || { enabled $2 && die "$2 is $1 and --enable-$1 is not specified."; }
 }
 
+die_license_disabled_gpl() {
+    enabled $1 || { enabled $2 && die "$2 is incompatible with the gpl and --enable-$1 is not specified."; }
+}
+
 die_license_disabled gpl libcdio
 die_license_disabled gpl libutvideo
 die_license_disabled gpl libx264
@@ -2862,7 +2866,7 @@ die_license_disabled gpl x11grab
 
 die_license_disabled nonfree libaacplus
 die_license_disabled nonfree libfaac
-enabled gpl && die_license_disabled nonfree openssl
+enabled gpl && die_license_disabled_gpl nonfree openssl
 
 die_license_disabled version3 libopencore_amrnb
 die_license_disabled version3 libopencore_amrwb