Nested function not recognized with cross-compiler

[lcrocker]

Issue Type: Bug

1. Set "compilerPath" in c_cpp_properties.json set to GCC cross-compiler, "cStandard" to "gnu17".
2. Enter nested function (A GCC extension that should be allowed by "gnu17")
3. Note that opening curly brace of inner function is red-squiggled, and hovering over it gives error indicating that it thinks the function definition is a declaration.

Note that when "compilerPath" is set to native compiler (e.g. /usr/bin/gcc), this doesn't happen.

Extension version: 1.4.1
VS Code version: Code 1.56.2 (054a9295330880ed74ceaedda236253b4f39a335, 2021-05-12T16:45:26.313Z)
OS version: Linux x64 5.8.0-55-generic

System Info

Item	Value
CPUs	Intel(R) Core(TM) i3-3217U CPU @ 1.80GHz (4 x 1379)
GPU Status	2d_canvas: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: disabled_off opengl: enabled_on rasterization: disabled_software skia_renderer: enabled_on video_decode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	0, 0, 0
Memory (System)	15.57GB (6.91GB free)
Process Argv	. --no-sandbox --crash-reporter-id 7e7bcae0-2227-4333-a86b-b3c3f8b1dcce
Screen Reader	no
VM	0%
DESKTOP_SESSION	ubuntu
XDG_CURRENT_DESKTOP	Unity
XDG_SESSION_DESKTOP	ubuntu
XDG_SESSION_TYPE	x11

A/B Experiments

vsliv368:30146709
vsreu685:30147344
python383:30185418
pythonvspyt602:30300191
vspor879:30202332
vspor708:30202333
vspor363:30204092
pythonvspyt639:30300192
pythontb:30283811
vspre833cf:30267465
pythonptprofiler:30281270
vshan820:30294714
pythondataviewer:30285071
vscus158cf:30286554
pythonvsuse255:30319631
vscgsv2:30307504
vscorehov:30309549
vscod805cf:30301675
binariesv517cf:30312826

[sean-mcmanus]

Duplicate of #1035. The VS issue was closed as low priority (https://developercommunity.visualstudio.com/t/intellisense-in-gcc-mode-does-not-recognize-nested/794903), but I re-activated it.