build/meson: sort compiler flags in "meson.build"

Also remove duplicates.

meson.build

@@ -184,11 +184,14 @@ common_flags += cc.get_supported_arguments([
   '-Wmissing-declarations',
   '-Wmissing-include-dirs',
   '-Wmissing-prototypes',
+  '-Wparentheses-equality',
   '-Wpointer-arith',
   '-Wshadow',
   '-Wshift-negative-value',
   '-Wstrict-prototypes',
+  '-Wtypedef-redefinition',
   '-Wundef',
+  '-Wunknown-attributes',
   '-Wvla',
   '-Wno-duplicate-decl-specifier',
   '-Wno-format-truncation',
@@ -200,13 +203,6 @@ common_flags += cc.get_supported_arguments([
   '-Wno-tautological-constant-out-of-range-compare',
   '-Wno-unknown-pragmas',
   '-Wno-unused-parameter',
-  '-Wparentheses-equality',
-  '-Wpointer-arith',
-  '-Wshadow',
-  '-Wstrict-prototypes',
-  '-Wtypedef-redefinition',
-  '-Wundef',
-  '-Wunknown-attributes',
   '-fno-strict-aliasing',
 ])