[libgit2-glib] meson: Remove workaround comment and add proper fix to NDEBUG

[Alberto Fanjul <albfan src gnome org>]

commit da5fc851748dba13df1c58a055bcb188345242fa
Author: Iñigo Martínez <inigomartinez gmail com>
Date:   Thu May 20 20:11:53 2021 +0200

    meson: Remove workaround comment and add proper fix to NDEBUG
    
    Due to an issue with meson's `buildtype` and `b_ndebug` options[0],
    the `b_ndebug` option was converted to a combo option.
    
    This forced `libgit2-glib` to use a workaround that has ended being
    the standard meson's behavior. The `b_ndebug` option has also gained
    another option called `if-release`.
    
    Due to this changes, the workaround comment has been removed and
    proper fix has been used in place.
    
    [0] https://github.com/mesonbuild/meson/pull/1896

 meson.build | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
---
diff --git a/meson.build b/meson.build
index ab37219..f3e6b41 100644
--- a/meson.build
+++ b/meson.build
@@ -99,9 +99,7 @@ else
   ]
 endif
 
-# Workaround for meson's bug
-# https://github.com/mesonbuild/meson/pull/1896
-if get_option('b_ndebug') == 'true'
+if ['true', 'if-release'].contains(get_option('b_ndebug'))
   common_flags += ['-DG_DISABLE_ASSERT']
 endif