Re-enable reporting git version in Meson dev builds.

src/meson.build

@@ -1,9 +1,21 @@
 # Version
+
+if meson.project_version().endswith('-dev')
+  # Development build
+  geary_version_vala = vcs_tag(
+    command: '../build-aux/git_version.py',
+    input: 'geary-version.vala.in',
+    output: 'geary-version.vala',
+    replace_string: '@VERSION@'
+  )
+else
+  # Release build
   geary_version_vala = configure_file(
     input: 'geary-version.vala.in',
     output: 'geary-version.vala',
     configuration: conf,
   )
+endif
 
 # Common vala options
 geary_vala_options = [