mingw32 configure patch by (Bill Eldridge <bill at rfa dot org>)

Originally committed as revision 1351 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -59,6 +59,7 @@ vorbis="no"
 a52="yes"
 a52bin="no"
 win32="no"
+mingw32="no"
 cygwin="no"
 lshared="no"
 extralibs="-lm"
@@ -148,6 +149,13 @@ CFLAGS="-no-cpp-precomp -pipe -O3 -fomit-frame-pointer -mdynamic-no-pic"
 ;;
 esac
 ;;
+MINGW32*)
+v4l="no"
+audio_oss="no"
+ffserver="no"
+network="no"
+mingw32="yes"
+;;
 CYGWIN*)
 v4l="no"
 audio_oss="yes"
@@ -272,6 +280,8 @@ for opt do
   ;;
   --enable-win32) win32="yes"
   ;;
+  --enable-mingw32) mingw32="yes"
+  ;;
   --enable-shared) lshared="yes"
   ;;
   --disable-mpegaudio-hp) mpegaudio_hp="no"
@@ -343,6 +353,13 @@ if test "$win32" = "yes" ; then
     network="no"
 fi
 
+if test "$mingw32" = "yes" ; then
+    cross_prefix=""
+    v4l="no"
+    audio_oss="no"
+    network="no"
+fi
+
 cc="${cross_prefix}${cc}"
 ar="${cross_prefix}${ar}"
 ranlib="${cross_prefix}${ranlib}"
@@ -465,6 +482,7 @@ echo "  --prefix=PREFIX          install in PREFIX [$prefix]"
 echo "  --enable-mp3lame         enable mp3 encoding via libmp3lame [default=no]"
 echo "  --enable-vorbis          enable vorbis support via libvorbisenc [default=no]"
 echo "  --enable-win32           enable win32 cross compile"
+echo "  --enable-mingw32         enable mingw32 native windows compile"
 echo "  --disable-a52            disable GPL'ed A52 support [default=no]"
 echo "  --enable-a52bin          open liba52.so.0 at runtime [default=no]"
 echo "  --enable-shared          build shared libraries [default=no]"
@@ -673,6 +691,13 @@ if test "$win32" = "yes" ; then
   echo "CONFIG_WIN32=yes" >> config.mak
 fi
 
+if test "$mingw32" = "yes" ; then
+  echo "#define CONFIG_WIN32 1" >> $TMPH
+  echo "CONFIG_WIN32=yes" >> config.mak
+  echo "#define __MINGW32__ 1" >> $TMPH
+  echo "__MINGW32__=1" >> config.mak
+fi
+
 if test "$cygwin" = "yes" ; then
   # setup correct exesuffix
   echo "CONFIG_WIN32=yes" >> config.mak