libvirt: silence inlining warning

We silence the following warning about inlining cleanup methods of the
glib:

libvirt> /nix/store/0784w06097k9i46zipgjf05l87i19jj0-glib-2.84.3-dev/include/glib-2.0/glib/gmacros.h:1342:43: warning: inlining failed in call to 'glib_autoptr_cleanup_virNetlinkMsg': call is unlikely and code size would grow [-Winline]
libvirt>  1342 | #define _GLIB_AUTOPTR_FUNC_NAME(TypeName) glib_autoptr_cleanup_##TypeName
libvirt>       |                                           ^~~~~~~~~~~~~~~~~~~~~
libvirt> /nix/store/0784w06097k9i46zipgjf05l87i19jj0-glib-2.84.3-dev/include/glib-2.0/glib/gmacros.h:1362:36: note: in expansion of macro '_GLIB_AUTOPTR_FUNC_NAME'
libvirt>  1362 |   static G_GNUC_UNUSED inline void _GLIB_AUTOPTR_FUNC_NAME(TypeName) (TypeName **_ptr)                          \
libvirt>       |                                    ^~~~~~~~~~~~~~~~~~~~~~~
libvirt> /nix/store/0784w06097k9i46zipgjf05l87i19jj0-glib-2.84.3-dev/include/glib-2.0/glib/gmacros.h:1379:3: note: in expansion of macro '_GLIB_DEFINE_AUTOPTR_CLEANUP_FUNCS'
libvirt>  1379 |   _GLIB_DEFINE_AUTOPTR_CLEANUP_FUNCS(TypeName, TypeName, func)
libvirt>       |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libvirt> ../src/util/virnetlink.h:31:1: note: in expansion of macro 'G_DEFINE_AUTOPTR_CLEANUP_FUNC'
libvirt>    31 | G_DEFINE_AUTOPTR_CLEANUP_FUNC(virNetlinkMsg, nlmsg_free);
libvirt>       | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libvirt> ../src/util/virnetlink.c:791:30: note: called from here
libvirt>   791 |     g_autoptr(virNetlinkMsg) nl_msg = NULL;

On-behalf-of: SAP stefan.kober@sap.com

Author: hertrste

tests/common.nix

@@ -217,6 +217,11 @@ in
         "-Ddriver_vz=disabled"
         "-Db_sanitize=leak"
         "-Db_sanitize=address,undefined"
+        # Enabling the sanitizers has led to warnings about inlining macro
+        # generated cleanup methods of the glib which spam the build log.
+        # Ignoring and suppressing the warnings seems like the only option.
+        # "warning: inlining failed in call to 'glib_autoptr_cleanup_virNetlinkMsg': call is unlikely and code size would grow [-Winline]"
+        "-Dc_args=-Wno-inline"
       ];
     });
   };