tools/imgui: disable all warnings

This is an external project we have no control over, and will not be
fixing (other than by sometimes pulling the latest sources), so warnings
serve no purpose here.

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/tools/imgui/meson.build

@@ -1,6 +1,7 @@
 libintel_imgui_core = static_library(
   'intel_imgui_core',
   files('imgui.cpp', 'imgui_demo.cpp', 'imgui_draw.cpp'),
+  cpp_args : ['-w'],
   install: false
 )
 
@@ -13,7 +14,7 @@ libintel_imgui_gtk = static_library(
   'intel_imgui_gtk',
   files('imgui_impl_gtk3.cpp', 'imgui_impl_opengl3.cpp'),
   dependencies : libintel_imgui_gtk_deps,
-  cpp_args : ['-Wno-deprecated-declarations', '-Wno-parentheses'],
+  cpp_args : ['-w'],
   install: false
 )