Rename --cross-compile option to --enable-cross-compile.

Allows handling the option in a more standard fashion.

Originally committed as revision 12586 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -107,7 +107,7 @@ show_help(){
   echo "Advanced options (experts only):"
   echo "  --source-path=PATH       path to source code [$source_path]"
   echo "  --cross-prefix=PREFIX    use PREFIX for compilation tools [$cross_prefix]"
-  echo "  --cross-compile          assume a cross-compiler is used"
+  echo "  --enable-cross-compile   assume a cross-compiler is used"
   echo "  --target-os=OS           compiler targets OS [$targetos]"
   echo "  --cc=CC                  use C compiler CC [$cc]"
   echo "  --make=MAKE              use specified make [$make]"
@@ -770,6 +770,7 @@ CMDLINE_SELECT="
     $ARCH_EXT_LIST
     $CONFIG_LIST
     $THREADS_LIST
+    cross_compile
     debug
     extra_warnings
     logging
@@ -1008,8 +1009,6 @@ for opt do
     ;;
     --cross-prefix=*) cross_prefix="$optval"
     ;;
-    --cross-compile) enable cross_compile
-    ;;
     --target-os=*) targetos="$optval"
     ;;
     --cc=*) cc="$optval"
@@ -1486,7 +1485,7 @@ EOF
 if test "$?" != 0; then
     echo "$cc is unable to create an executable file."
     if test -z "$cross_prefix" && ! enabled cross_compile ; then
-        echo "If $cc is a cross-compiler, use the --cross-compile option."
+        echo "If $cc is a cross-compiler, use the --enable-cross-compile option."
         echo "Only do this if you know what cross compiling means."
     fi
     die "C compiler test failed."