devtools: add Windows cross-build test with MinGW

The Meson cross file is renamed from meson_mingw.txt to cross-mingw,
and is added to test-meson-builds.sh.

The only example supported on Windows so far is "helloworld",
that's why the default list of examples is overridden.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>

devtools/test-meson-builds.sh

@@ -200,6 +200,9 @@ if [ "$ok" = "false" ] ; then
 fi
 build build-x86-default cc -Dlibdir=lib -Dmachine=$default_machine $use_shared
 
+# x86 MinGW
+build build-x86-mingw $srcdir/config/x86/cross-mingw -Dexamples=helloworld
+
 # generic armv8a with clang as host compiler
 f=$srcdir/config/arm/arm64_armv8_linux_gcc
 export CC="clang"

doc/guides/windows_gsg/build_dpdk.rst

@@ -111,5 +111,5 @@ Depending on the distribution, paths in this file may need adjustments.
 
 .. code-block:: console
 
-    meson --cross-file config/x86/meson_mingw.txt -Dexamples=helloworld build
+    meson --cross-file config/x86/cross-mingw -Dexamples=helloworld build
     ninja -C build