The throw_expect_type() function is marked as inline, by GCC complains
that the inline is unnecessary:

  inlining failed in call to ‘bool throw_expect_type(JSContext*,
    JS::HandleValue, const char*, GType)’: call is unlikely and
    code size would grow [-Winline]

This causes a build failure on Continuous, as it runs with -Werror
enabled.

Reviewed-by: nobody
Signed-off-by: Emmanuele Bassi <ebassi@gnome.org>