[libsoup] buildsystem: use MinGW ANSI STDIO when possible

[Tomas Popela <tpopela src gnome org>]

commit 050f8e29745ac7fe4238820c7a35e803668674ad
Author: Руслан Ижбулатов <lrn1986 gmail com>
Date:   Sat Mar 16 10:32:05 2019 +0000

    buildsystem: use MinGW ANSI STDIO when possible
    
    Fixes the following error:
    libsoup-2.66.0/libsoup/soup-auth-ntlm.c:815:23: error: unknown conversion type character 'h' in format 
[-Werror=format=]
     sscanf(hex_pos, "%2hhx", &hmac[count]);
                         ^

 meson.build | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/meson.build b/meson.build
index e4c5d755..4448b93c 100644
--- a/meson.build
+++ b/meson.build
@@ -57,6 +57,11 @@ else
   common_flags += cc.get_supported_arguments(test_cflags)
 endif
 
+if cc.get_id() != 'msvc' and host_system == 'windows'
+  # For "%2hhx" sscanf format and the like
+  add_project_arguments('-D__USE_MINGW_ANSI_STDIO=1', language : 'c')
+endif
+
 add_project_arguments(common_flags, language : 'c')
 
 glib_required_version = '>= 2.38'