meson: Enable some MSVC warnings for parity with GCC/Clang

This makes it easier to do development with MSVC by making it warn
on common issues that GCC/Clang error out for in our CI configuration.

Continuation from https://gitlab.freedesktop.org/gstreamer/gst-build/-/merge_requests/223

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/220>

meson.build

@@ -36,17 +36,24 @@ cdata = configuration_data()
 prefix = get_option('prefix')
 datadir = prefix / get_option('datadir')
 
+if cc.get_id() == 'msvc'
+  msvc_args = [
       # Ignore several spurious warnings for things gstreamer does very commonly
       # If a warning is completely useless and spammy, use '/wdXXXX' to suppress it
       # If a warning is harmless but hard to fix, use '/woXXXX' so it's shown once
       # NOTE: Only add warnings here if you are sure they're spurious
-if cc.get_id() == 'msvc'
-  add_project_arguments(
       '/wd4018', # implicit signed/unsigned conversion
       '/wd4146', # unary minus on unsigned (beware INT_MIN)
       '/wd4244', # lossy type conversion (e.g. double -> int)
       '/wd4305', # truncating type conversion (e.g. double -> float)
-      language : 'c')
+      cc.get_supported_arguments(['/utf-8']), # set the input encoding to utf-8
+
+      # Enable some warnings on MSVC to match GCC/Clang behaviour
+      '/w14062', # enumerator 'identifier' in switch of enum 'enumeration' is not handled
+      '/w14101', # 'identifier' : unreferenced local variable
+      '/w14189', # 'identifier' : local variable is initialized but not referenced
+  ]
+  add_project_arguments(msvc_args, language: 'c')
 endif
 
 if cc.has_link_argument('-Wl,-Bsymbolic-functions')