[mingw] Build with directwrite if available

configure.ac

@@ -374,7 +374,7 @@ if test "x$with_directwrite" = "xyes" -a "x$have_directwrite" != "xtrue"; then
 fi
 if $have_directwrite; then
 	DIRECTWRITE_CXXFLAGS=
-	DIRECTWRITE_LIBS=
+	DIRECTWRITE_LIBS=-ldwrite
 	AC_SUBST(DIRECTWRITE_CXXFLAGS)
 	AC_SUBST(DIRECTWRITE_LIBS)
 	AC_DEFINE(HAVE_DIRECTWRITE, 1, [Have DirectWrite library])

mingw-configure.sh

@@ -24,5 +24,7 @@ exec "$(dirname "$0")"/configure \
 	PKG_CONFIG_PATH=$HOME/.local/$target/share/pkgconfig:/usr/$target/sys-root/mingw/share/pkgconfig/ \
 	PATH=$HOME/.local/$target/bin:/usr/$target/sys-root/mingw/bin:/usr/$target/bin:$PATH \
 	--without-icu \
+	--with-gdi \
 	--with-uniscribe \
+	--with-directwrite=auto \
 	"$@"