build: use cc.get_supported_arguments() for warnings

Let's not require the C compiler to support specific warnings,
especially if half the flags are used to turn off the warnings
anyways.

Author: emersion

meson.build

@@ -11,22 +11,18 @@ project(
 	],
 )
 
-add_project_arguments('-D_POSIX_C_SOURCE=200809L', language: 'c')
+cc = meson.get_compiler('c')
 
-add_project_arguments(
-	[
-		'-Wno-unused-parameter',
-		'-Wno-unused-result',
-		'-Wundef',
-		'-Wvla',
-	],
-	language: 'c',
-)
+add_project_arguments('-D_POSIX_C_SOURCE=200809L', language: 'c')
 
-cc = meson.get_compiler('c')
+add_project_arguments(cc.get_supported_arguments([
+	'-Wno-unused-parameter',
+	'-Wno-unused-result',
+	'-Wundef',
+	'-Wvla',
+]), language: 'c')
 
 is_freebsd = host_machine.system().startswith('freebsd')
-
 if is_freebsd
 	add_project_arguments('-D_C11_SOURCE', language: 'c')
 endif