Revert "meson: disallow Venus debug + LTO build via GCC"

This reverts commit 423ba5d1c7.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30355>

meson.build

@@ -2291,12 +2291,6 @@ endif
 # as GCC LTO drops them. See: https://bugs.freedesktop.org/show_bug.cgi?id=109391
 gcc_lto_quirk = (cc.get_id() == 'gcc') ? ['-fno-lto'] : []
 
-# As of GCC 13.2.1, Venus build with optimization level plain/0 and LTO does not
-# compile properly: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11006
-if with_virtio_vk and cc.get_id() == 'gcc' and (get_option('optimization') == '0' or get_option('optimization') == 'plain') and get_option('b_lto') == true
-  error('Venus does not compile properly with GCC + optimization level plain/0 + LTO.')
-endif
-
 devenv = environment()
 
 dir_compiler_nir = join_paths(meson.current_source_dir(), 'src/compiler/nir/')