[Win32] Update the package configuration.

extras/package/win32/configure-mingw-release.sh

+#!/bin/sh
+
+root=$(echo $0|sed 's#extras/package/win32/configure-cygwin.sh##')./
+
 PATH="/usr/win32/bin:$PATH" \
 PKG_CONFIG_LIBDIR=/usr/win32/lib/pkgconfig \
 CPPFLAGS="-I/usr/win32/include -I/usr/win32/include/ebml" \
 LDFLAGS="-L/usr/win32/lib" \
 CC=i586-mingw32msvc-gcc CXX=i586-mingw32msvc-g++ \
-CONFIG="./configure --host=i586-mingw32msvc --build=i386-linux
+CONFIG="${root}configure --host=i586-mingw32msvc --build=i386-linux
  --enable-mkv --enable-release --enable-nls" \
-sh extras/package/win32/configure-common.sh
+sh ${root}extras/package/win32/configure-common.sh

extras/package/win32/configure-mingw.sh

+#!/bin/sh
+
+root=$(echo $0|sed 's#extras/package/win32/configure-cygwin.sh##')./
+
 PATH="/usr/win32/bin:$PATH" \
 PKG_CONFIG_LIBDIR=/usr/win32/lib/pkgconfig \
 CPPFLAGS="-I/usr/win32/include -I/usr/win32/include/ebml" \
 LDFLAGS="-L/usr/win32/lib" \
 CC=i586-mingw32msvc-gcc CXX=i586-mingw32msvc-g++ \
-CONFIG="./configure --host=i586-mingw32msvc --build=i386-linux
+CONFIG="${root}configure --host=i586-mingw32msvc --build=i386-linux
   --disable-mkv --disable-taglib --enable-debug" \
-sh extras/package/win32/configure-common.sh
+sh ${root}extras/package/win32/configure-common.sh

extras/package/win32/configure-msys.sh

+#!/bin/sh
+
+root=$(echo $0|sed 's#extras/package/win32/configure-cygwin.sh##')./
+
 PATH="/usr/win32/bin:$PATH" \
 PKG_CONFIG_LIBDIR=/usr/win32/lib/pkgconfig \
 CPPFLAGS="-I/usr/win32/include -I/usr/win32/include/ebml" \
 LDFLAGS="-L/usr/win32/lib" \
 CC=gcc CXX=g++ \
-CONFIG="./configure --host=i586-mingw32msvc --build=i386-linux
+CONFIG="${root}configure --host=i586-mingw32msvc --build=i386-linux
     --disable-mkv --disable-taglib --disable-nls --enable-debug" \
-sh extras/package/win32/configure-common.sh
+sh ${root}extras/package/win32/configure-common.sh