[calls] coverage: Exclude subprojects and generated dbus code

[Guido Günther <guidog src gnome org>]

commit 719f11f42baf2c0e791be43ab72db8f1e0ac1050
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Thu Nov 18 09:45:20 2021 +0100

    coverage: Exclude subprojects and generated dbus code

 gcovr.cfg | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gcovr.cfg b/gcovr.cfg
new file mode 100644
index 00000000..bcf6f6cf
--- /dev/null
+++ b/gcovr.cfg
@@ -0,0 +1,2 @@
+exclude = src/dbus
+exclude = subprojects/
\ No newline at end of file