meson: Utilise default compiler options

Remove our custom declarations for cpp_std=c++11, -Wall, -Wextra and
-Werror, instead prefering to use the built-in default_option parameters
from meson.

Our custom compiler flags (such as -Wno-unused-parameter) are
maintained.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

meson.build

@@ -1,6 +1,11 @@
 project('libcamera', 'c', 'cpp',
   meson_version: '>= 0.40',
   version : '0.1',
+  default_options: [
+    'werror=true',
+    'warning_level=2',
+    'cpp_std=c++11',
+  ],
   license : 'LGPL 2.1+')
 
 # TODO: Extract this from project.version.
@@ -9,15 +14,11 @@ project('libcamera', 'c', 'cpp',
 api_version = '0.1'
 
 common_arguments = [
-    '-Wall',
-    '-Wextra',
-    '-Werror',
     '-Wno-unused-parameter',
 ]
 
 c_arguments = common_arguments
 cpp_arguments = common_arguments
-cpp_arguments += '-std=c++11'
 
 add_project_arguments(c_arguments, language: 'c')
 add_project_arguments(cpp_arguments, language: 'cpp')