Fix some mxe build issues

config.d/vulkan.m4

@@ -16,7 +16,7 @@ if test "x$HAVE_VULKAN" != xno; then
 			VULKAN_QCFLAGS="-I$VULKAN_SDK/include"
 			VULKAN_LDFLAGS="-L$VULKAN_SDK/lib"
 		],[
-			VULKAN_QCFLAGS="-I/usr/include"
+			VULKAN_QCFLAGS="-I${QCSYSPREFIX-/usr}/include"
 		])
 	  ], [HAVE_VULKAN=no])
 	CPPFLAGS="$save_CPPFLAGS"

libs/ecs/entity.c

@@ -126,7 +126,7 @@ Ent_RemoveComponent (uint32_t ent, uint32_t comp, ecs_registry_t *registry)
 		// if ind >= the last range, then it is outside the subpools
 		if (range_count && ind < subpool->ranges[range_count - 1]) {
 			uint32_t   *range = find_range (subpool, ind);
-			while (range - subpool->ranges < range_count) {
+			while ((size_t) (range - subpool->ranges) < range_count) {
 				uint32_t    end = --*range;
 				range++;
 				if (ind < end) {

libs/video/renderer/vulkan/vulkan_draw.c

@@ -72,7 +72,7 @@
 #include "r_internal.h"
 #include "vid_vulkan.h"
 
-static const char *draw_pass_names[] = {
+static const char * __attribute__((used)) draw_pass_names[] = {
 	"2d",
 };
 

tools/cross/mingw/cross-configure.sh

@@ -14,6 +14,7 @@ export MINGW_USR=$MINGW/usr/i686-w64-mingw32.static
 export PKG_CONFIG_LIBDIR=$MINGW_USR/lib/pkgconfig
 export PKG_CONFIG_PATH=$MINGW_USR/local/lib/pkgconfig
 export PATH=$MINGW/usr/bin:$PATH
+export QCSYSPREFIX=$MINGW_USR
 ../../configure \
 	--host=i686-w64-mingw32.static \
 	--disable-shared \

tools/cross/mingw64/cross-configure.sh

@@ -5,6 +5,7 @@ cd native
 ../../configure \
 	--enable-silent-rules \
 	--disable-shared \
+	--disable-optimize \
 	--without-clients \
 	--without-servers \
 	--with-tools=qfcc,pak,qwaq
@@ -14,6 +15,7 @@ export MINGW_USR=$MINGW/usr/x86_64-w64-mingw32.static
 export PKG_CONFIG_LIBDIR=$MINGW_USR/lib/pkgconfig
 export PKG_CONFIG_PATH=$MINGW_USR/local/lib/pkgconfig
 export PATH=$MINGW/usr/bin:$PATH
+export QCSYSPREFIX=$MINGW_USR
 ../../configure \
 	--host=x86_64-w64-mingw32.static \
 	--disable-shared \