Tolerate missing Environment variable for compiler registration

[ReinhardKeil]

The Problem To Be Solved

Users that install GCC without the Arm Environment Manager are required to set a Environment Variable to register the compiler.

However for several compilers, this information is already present due to the PATH setup.

PATH=
...\.vcpkg\artifacts\2139c4c6\compilers.arm.armclang\6.22.0\bin;
...\.vcpkg\artifacts\2139c4c6\compilers.arm.arm.none.eabi.gcc\13.3.1\bin

(Optional): Suggest A Solution

Could this information being used when the Environment Variable is missing?

[jkrech]

MCUXpresso Installer installs in this directory without setting an environment variable

C:\Users\<user>\.mcuxpressotools\arm-gnu-toolchain-13.2.Rel1-mingw-w64-i686-arm-none-eabi

[ReinhardKeil]

We find no easy way to achieve that.