util.cpp ‘wxASCII_STR’ was not declared

Description

The compiler complains about wxASCII_STR since Commit 0b4a680d.

Steps to reproduce

1. Pull the most recent version
2. start compile

KiCad Version

Application: KiCad

Version: (5.99.0-10726-g787924b041), release build

Libraries:
	wxWidgets 3.0.4
	libcurl/7.64.0 GnuTLS/3.6.7 zlib/1.2.11 libidn2/2.0.5 libpsl/0.20.2 (+libidn2/2.0.5) libssh2/1.8.0 nghttp2/1.36.0 librtmp/2.3

Platform: Linux 4.19.0-16-amd64 x86_64, 64 bit, Little endian, wxGTK, KDE, x11

Build Info:
	Date: Jun  1 2021 09:34:07
	wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
	Boost: 1.67.0
	OCE: 6.9.1
	Curl: 7.64.0
	ngspice: 31
	Compiler: GCC 8.3.0 with C++ ABI 1013

Build settings:
	KICAD_SCRIPTING=ON
	KICAD_SCRIPTING_MODULES=ON
	KICAD_SCRIPTING_PYTHON3=OFF
	KICAD_SCRIPTING_WXPYTHON=ON
	KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
	KICAD_SCRIPTING_ACTION_MENU=ON
	KICAD_USE_OCE=ON
	KICAD_SPICE=ON