[gtksourceview/meson.msvc.cleanups: 1/4] meson.build: Clean up MSVC libxml search

[Chun-wei Fan <fanchunwei src gnome org>]

commit 9d13641bdd2cd80a1c7c20181cc956de7409d19a
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Nov 21 11:47:32 2019 +0800

    meson.build: Clean up MSVC libxml search
    
    Bump the required Meson version to 0.50.0 and use the has_headers
    sub-method of cc.find_library(), so that things are cleaner for this.

 meson.build | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)
---
diff --git a/meson.build b/meson.build
index d1f83412..43cb8c4f 100644
--- a/meson.build
+++ b/meson.build
@@ -1,7 +1,7 @@
 project('gtksourceview', 'c',
           version: '4.5.1',
           license: 'LGPL-2.1-or-later',
-    meson_version: '>= 0.49.0',
+    meson_version: '>= 0.50.0',
   default_options: [ 'c_std=gnu99',
                      'buildtype=debugoptimized',
                      'warning_level=2' ],
@@ -117,15 +117,7 @@ endif
 # for us.  Remove once Meson gains the ability to declare
 # deps in a declarative way
 if cc.get_id() == 'msvc' and not libxml_dep.found()
-  libxml_headers = ['xmlreader', 'parser']
-  libxml_headers_missing = false
-  foreach h: libxml_headers
-    if not cc.has_header('libxml/@0@.h'.format(h))
-      libxml_headers_missing = true
-    endif
-  endforeach
-  assert(not libxml_headers_missing, 'The libxml2 headers and libs are required')
-  libxml_dep = cc.find_library('libxml2')
+  libxml_dep = cc.find_library('libxml2', has_headers: ['libxml/xmlreader.h', 'libxml/parser.h'])
 endif
 
 xmllint_prg = find_program('xmllint', required: false)