meson: fix -Wall warning

Meson already handles Wall via the built-in warning_level option.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20201207130055.462734-2-marcandre.lureau@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

meson.build

@@ -6,8 +6,8 @@ project('dtc', 'c',
 
 cc = meson.get_compiler('c')
 
-add_project_arguments(cc.get_supported_arguments([
-  '-Wall',
+add_project_arguments(
+  cc.get_supported_arguments([
     '-Wpointer-arith',
     '-Wcast-qual',
     '-Wnested-externs',
@@ -15,7 +15,9 @@ add_project_arguments(cc.get_supported_arguments([
     '-Wmissing-prototypes',
     '-Wredundant-decls',
     '-Wshadow'
-]),language: 'c')
+  ]),
+  language: 'c'
+)
 
 if host_machine.system() == 'windows'
   add_project_arguments(