Improve error reporting when an external tool fails to print some of stderr (up to 1024 characters).
Before:
error : clang exited with code 1
After:
error : clang exited with code 1:
error : [...]/xamarin-macios/tests/dotnet/MyInterpretedApp/iOS/obj/Debug/net6.0-ios/iossimulator-x64/linker-cache/main.x86_64.mm:58:25: error: use of undeclared identifier 'MONO_AOT_MODE_INTERP_ONLY'; did you mean 'MONO_AOT_MODE_INTERP'?
error : mono_jit_set_aot_mode (MONO_AOT_MODE_INTERP_ONLY);
error : ^~~~~~~~~~~~~~~~~~~~~~~~~
error : MONO_AOT_MODE_INTERP
error : [...]/xamarin-macios/builds/downloads/dotnet-sdk-6.0.301-rtm.22254.17-osx-x64/packs/Microsoft.iOS.Runtime.iossimulator-x64/15.4.16-ci.x64-interpreter-only/runtimes/iossimulator-x64/native/xamarin/mono-runtime.h:452:2: note: 'MONO_AOT_MODE_INTERP' declared here
error : MONO_AOT_MODE_INTERP,
error : ^
fe6a06dbca