[glib: 1/2] meson: fix str[n]casecmp detection on clang-cl

[Philip Withnall <pwithnall src gnome org>]

commit 1eac0c39f9828c1cd3a3d9d052d10974a359dd51
Author: Aleksandr Mezin <mezin alexander gmail com>
Date:   Sun Feb 28 02:27:13 2021 +0600

    meson: fix str[n]casecmp detection on clang-cl
    
    Meson incorrectly detects strcasecmp, strncasecmp on clang-cl if 'prefix:'
    is not specified for cc.has_function().
    
    See https://github.com/mesonbuild/meson/issues/5628
    
    Fixes https://gitlab.gnome.org/GNOME/glib/-/issues/2337
    
    Before this change:
    msvc was using _stricmp()
    gcc on mingw was using strcasecmp()
    gcc on linux was using strcasecmp()
    clang-cl was trying to use strcasecmp()
    
    After this change:
    msvc is using _stricmp()
    gcc on mingw is using strcasecmp()
    gcc on linux is using strcasecmp()
    clang-cl is using _stricmp()
    
    Tests are still failing to build with clang-cl, but that's a separate issue.

 meson.build | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 1de9d929c..b091a7489 100644
--- a/meson.build
+++ b/meson.build
@@ -662,7 +662,7 @@ elif cc.has_function('_snprintf') or cc.has_header_symbol('stdio.h', '_snprintf'
   glib_conf_prefix = glib_conf_prefix + '#define HAVE_SNPRINTF ' + hack_define
 endif
 
-if cc.has_function('strcasecmp')
+if cc.has_function('strcasecmp', prefix: '#include <strings.h>')
   glib_conf.set('HAVE_STRCASECMP', 1)
   glib_conf_prefix = glib_conf_prefix + '#define HAVE_STRCASECMP 1\n'
 elif cc.has_function('_stricmp')
@@ -671,7 +671,7 @@ elif cc.has_function('_stricmp')
   glib_conf_prefix = glib_conf_prefix + '#define HAVE_STRCASECMP ' + hack_define
 endif
 
-if cc.has_function('strncasecmp')
+if cc.has_function('strncasecmp', prefix: '#include <strings.h>')
   glib_conf.set('HAVE_STRNCASECMP', 1)
   glib_conf_prefix = glib_conf_prefix + '#define HAVE_STRNCASECMP 1\n'
 elif cc.has_function('_strnicmp')