[test] Allow running test suite under wine

Set exe_wrapper in the Windows cross files, which will cause unit tests
to be run with wine.

When we call the binary ourselves, e.g. in shape run-tests.py, we need
to check for MESON_EXE_WRAPPER env var (which meson sets automatically
if exe_wrapper is set) and use it.

.ci/win32-cross-file.txt

@@ -19,3 +19,4 @@ objcopy = 'i686-w64-mingw32-objcopy'
 strip = 'i686-w64-mingw32-strip'
 windres = 'i686-w64-mingw32-windres'
 pkg-config = 'i686-w64-mingw32-pkg-config'
+exe_wrapper = 'wine'

.ci/win64-cross-file.txt

@@ -19,3 +19,4 @@ objcopy = 'x86_64-w64-mingw32-objcopy'
 strip = 'x86_64-w64-mingw32-strip'
 windres = 'x86_64-w64-mingw32-windres'
 pkg-config = 'x86_64-w64-mingw32-pkg-config'
+exe_wrapper = 'wine'

test/shape/run-tests.py

@@ -16,11 +16,18 @@ hb_shape, args = args[0], args[1:]
 env = os.environ.copy()
 env["LC_ALL"] = "C"
 
+EXE_WRAPPER = os.environ.get("MESON_EXE_WRAPPER")
+
 
 def open_shape_batch_process():
     global hb_shape, env
+
+    cmd = [hb_shape, "--batch"]
+    if EXE_WRAPPER:
+        cmd = [EXE_WRAPPER] + cmd
+
     process = subprocess.Popen(
-        [hb_shape, "--batch"],
+        cmd,
         stdin=subprocess.PIPE,
         stdout=subprocess.PIPE,
         stderr=sys.stdout,
@@ -79,8 +86,12 @@ def all_whats(what):
 for what in ["shaper", "face-loader", "font-funcs"]:
     subcommand = "--list-" + plural(what)
 
+    cmd = [hb_shape, subcommand]
+    if EXE_WRAPPER:
+        cmd = [EXE_WRAPPER] + cmd
+
     what_process = subprocess.Popen(
-        [hb_shape, subcommand],
+        cmd,
         stdin=subprocess.PIPE,
         stdout=subprocess.PIPE,
         stderr=sys.stdout,