Improved cross compiling support on Linux for Windows.

- In case of cross compiling of the win32 gui, use the environment variable
  WINDRES for the name of the resource compiler.
- Added example shortcut script for cross compiling on Linux for Windows.

bochs/.conf.win64-cross-mingw32

@@ -0,0 +1,36 @@
+#!/bin/sh
+#
+# Example script for configuring and compiling Bochs on Linux for Windows.
+#
+
+CC="x86_64-w64-mingw32-gcc"
+CXX="x86_64-w64-mingw32-g++"
+CFLAGS="-O3 -Wall -Wno-format -mno-ms-bitfields"
+CXXFLAGS="$CFLAGS"
+WINDRES="x86_64-w64-mingw32-windres"
+
+export CC
+export CXX
+export CFLAGS
+export CXXFLAGS
+export WINDRES
+
+./configure --host=x86_64-linux --target=x86_64-mingw32 \
+            --enable-sb16 \
+            --enable-ne2000 \
+            --enable-all-optimizations \
+            --enable-cpu-level=6 \
+            --enable-x86-64 \
+            --enable-vmx=2 \
+            --enable-pci \
+            --enable-clgd54xx \
+            --enable-voodoo \
+            --enable-usb \
+            --enable-usb-ohci \
+            --enable-usb-ehci \
+            --enable-usb-xhci \
+            --enable-busmouse \
+            --enable-es1370 \
+            --enable-e1000 \
+            --enable-show-ips \
+            --with-win32 --with-rfb --with-nogui

bochs/configure

@@ -24821,7 +24821,11 @@ if test "$with_win32" = yes; then
        ;;
     *-cygwin* | *-mingw32* | *-msys)
        if test "$with_wx" != yes; then
-         RC_CMD="windres -I. -o "
+         if test "$cross_compiling" = no; then
+           RC_CMD="windres -I. -o "
+         else
+           RC_CMD="$WINDRES -I. -o "
+         fi
          EXTRA_BX_OBJS="$EXTRA_BX_OBJS win32res.o"
        fi
        GUI_LINK_OPTS="$GUI_LINK_OPTS \$(GUI_LINK_OPTS_WIN32)"

bochs/configure.in

@@ -2523,7 +2523,11 @@ if test "$with_win32" = yes; then
        ;;
     *-cygwin* | *-mingw32* | *-msys)
        if test "$with_wx" != yes; then
-         RC_CMD="windres -I. -o "
+         if test "$cross_compiling" = no; then
+           RC_CMD="windres -I. -o "
+         else
+           RC_CMD="$WINDRES -I. -o "
+         fi
          EXTRA_BX_OBJS="$EXTRA_BX_OBJS win32res.o"
        fi
        GUI_LINK_OPTS="$GUI_LINK_OPTS \$(GUI_LINK_OPTS_WIN32)"