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Environment variables are not passed with user-space semihosting
Description of problem:
Environment variables are not passed to the emulated process, either inherited (as I might expect it to work in user-space?) or by specifying the values through the QEMU command-line. Note that setting the environment variable from within the app before calling `getenv` does work, so it isn't just a case of some system no-ops for the platform.
Steps to reproduce:
1. Compile the following program with [ARM embedded toolchain](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads):
```cpp
#include <iostream>
#include <cstdlib>
int main(int argc, char* argv[]) {
char* env = std::getenv("TEST");
if (env)
std::cout << "Env TEST: " << env << "\n";
else
std::cout << "Env TEST not set.\n";
return 0;
}
```
```
$ $CXX --version
arm-none-eabi-g++ (GNU Arm Embedded Toolchain 10-2020-q4-major) 10.2.1 20201103 (release)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ $CXX main.cpp --specs=rdimon.specs -mcpu=cortex-m7
```
2. Run in user-space (semihosted):
```
$ qemu-arm -cpu cortex-m7 -E TEST=val123 ./a.out
Env TEST not set.
```
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