Executable doesn't terminate

**Describe the bug**
After compiling and starting the executable, the test program starts but doesn't terminate (and also doesn't print any output)

**Expected behavior**
The program terminates with all tests (1/1, 1 assert) passed within at most 10 seconds (more like within a fraction of a second, but I'll give it 10 seconds to allow for Windows delays)

**Reproduction steps**
1. Create a directory with `catch.hpp` and a file `test.cpp` with the following test
```
#define CATCH_CONFIG_MAIN
#include "catch.hpp"

TEST_CASE( "--test name--", "[tags]" ) {
char val = GENERATE(random(0, 1));
}
```
2. Command: `g++ -Wall -Wextra -o test.exe test.cpp && echo "running tests" && ./test.exe`
(Note: also does not work with seperate g++ and running commands)

**Platform information:**

- OS: **Windows 10, build 17763.437**
- Compiler+version: **gcc version 8.2.0 (MinGW.org GCC-8.2.0-3)**
- Catch version: **v2.7.2**
- Command was ran from GitBash shell and cygwin shell, both exhibit this bug.

**Additional context**
This is a minimized version of the bug (i.e. I reduced the test to the bare minimum to get the bug to appear)
The values for `random` don't influence the bug.
The program uses 12.5% CPU time. Since I have 8 cores, I assume it is hogging a core.

Reproduce the hang with the provided test.cpp, catch.hpp, and the g++ command on the reported Windows and MinGW setup. Start by tracing the minimal TEST_CASE that calls GENERATE(random(0, 1)); done means the executable terminates within 10 seconds and reports the single passing test with its assertion.

Written by the indexing model from the issue text.