meson: Specify that build-machine compiler for C++ is not required
When cross-compiling Windows binaries on (for example) Linux, we only need a Windows C++ compiler and not a Linux C++ compiler.
Resolves: #439 (closed)
When cross-compiling Windows binaries on (for example) Linux, we only need a Windows C++ compiler and not a Linux C++ compiler.
Resolves: #439 (closed)