[gtk/wip.win32.fixes] meson.build: Don't apply iso-codes cflag on Windows

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

commit 428aa3de3eafa682373bb8c6155229560d8e58d8
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Jan 10 15:04:57 2022 +0800

    meson.build: Don't apply iso-codes cflag on Windows
    
    They are no longer applicable for Windows builds.

 meson.build | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/meson.build b/meson.build
index f47c164bf0..23c72928ee 100644
--- a/meson.build
+++ b/meson.build
@@ -455,10 +455,12 @@ cdata.set('HAVE_TRACKER3', tracker3_dep.found())
 colord_dep = dependency('colord', version: '>= 0.1.9', required: get_option('colord'))
 cdata.set('HAVE_COLORD', colord_dep.found())
 
-if iso_codes_dep.found()
-  cdata.set_quoted('ISO_CODES_PREFIX', iso_codes_dep.get_variable(pkgconfig: 'prefix'))
-else
-  cdata.set_quoted('ISO_CODES_PREFIX', '/usr')
+if not os_win32
+  if iso_codes_dep.found()
+    cdata.set_quoted('ISO_CODES_PREFIX', iso_codes_dep.get_variable(pkgconfig: 'prefix'))
+  else
+    cdata.set_quoted('ISO_CODES_PREFIX', '/usr')
+  endif
 endif