meson: generate version.hxx on compile

This fixes local builds (re-generates version.hxx if
it gets removed), ninja dist now works correctly too.

Signed-off-by: Harry van Haaren <harryhaaren@gmail.com>

meson.build

@@ -38,5 +38,5 @@ foreach dep : dep_names
 endforeach
 
 # compile the main project
-executable('luppp', luppp_src,
+executable('luppp', luppp_src + [version_hxx],
     dependencies: deps)

src/meson.build

@@ -1,3 +1,7 @@
+version_hxx = vcs_tag(
+    input  : 'version.hxx.in',
+    output : 'version.hxx')
+
 luppp_src = files(
   'audiobuffer.cxx',
   'controllerupdater.cxx',

src/version.hxx.in

@@ -0,0 +1 @@
+#define GIT_VERSION "@VCS_TAG@"