Add another flag for enabling a bit bridge build

src/common/config/meson.build

@@ -1,3 +1,16 @@
+# Contains constants determined while configuring the build. As an alternative
+# to preprocessor macros.
+config_header = configure_file(
+  input : 'config.h.in',
+  output : 'config.h',
+  configuration : configuration_data(
+    {
+      'host_binary_32bit': host_name_32bit + '.exe',
+      'host_binary_64bit': host_name_64bit + '.exe',
+    }
+  )
+)
+
 # Generate a file containing the last annotated git tag and possibly also the
 # amount of commits since then and the hash of the last commit
 version_header = vcs_tag(