[gnome-bluetooth/dont-run-tests-without-introspection] build: Only run tests if introspection is enabled

[Felipe Borges <felipeborges src gnome org>]

commit c8e88a9cd2cbb67572f5387a28286a1b3c9a99fb
Author: Felipe Borges <felipeborges gnome org>
Date:   Thu Mar 11 12:16:44 2021 +0100

    build: Only run tests if introspection is enabled
    
    A build with -Dintrospection=false will fail if tests are ran.
    
    The integration tests added by commit 77b67c702 are written in
    Python and require gobject-introspection bindings to be generated.
    
    meson errors out with:
    ../tests/meson.build:7:0: ERROR: Unknown variable "gnomebt_priv_gir".

 meson.build | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 2a1d726f..09ec3cc5 100644
--- a/meson.build
+++ b/meson.build
@@ -114,7 +114,10 @@ if enable_gtk_doc
 endif
 
 subdir('po')
-subdir('tests')
+
+if enable_gir
+  subdir('tests')
+endif
 
 configure_file(
   output: 'config.h',