meson, configure: move --with-pkgversion, CONFIG_STAMP to meson

The hash is now generated with a Python script.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/docs/meson.build b/docs/meson.build
index 831d4ae..9136fed 100644
--- a/docs/meson.build
+++ b/docs/meson.build
@@ -35,7 +35,7 @@
 endif
 
 if build_docs
-  SPHINX_ARGS += ['-Dversion=' + meson.project_version(), '-Drelease=' + config_host['PKGVERSION']]
+  SPHINX_ARGS += ['-Dversion=' + meson.project_version(), '-Drelease=' + get_option('pkgversion')]
 
   man_pages = {
         'qemu-ga.8': (have_ga ? 'man8' : ''),