Jakt: Ensure cxx-compiler-path matches the compiler that compiled jakt (

#4514)

The way that jakt calls out to a C++ compiler to compile the C++ source
files it generates is sensitive to which compiler compiled its runtime
library. Rather than using clang-trunk, use the same compiler that was
used in misc-builder: gcc-12.1.0. This does cause a warning or two, as
it seems gcc 12.1.0 doesn't implement [[unlikely]] yet, but that's
better than not being able to link executables at all.

This issue will likely come up again if the compiler used in
misc-builder to build the jakt compiler changes.

etc/config/jakt.amazon.properties

@@ -16,5 +16,4 @@ licensePreamble=Copyright (c) 2022, JT, Andreas Kling. All rights reserved.
 
 compiler.selfhosted.exe=/opt/compiler-explorer/jakt-trunk/bin/jakt
 compiler.selfhosted.name=jakt (trunk)
-compiler.selfhosted.options=--runtime-path /opt/compiler-explorer/jakt-trunk/runtime --prettify-cpp-source --clang-format-path /opt/compiler-explorer/clang-trunk/bin/clang-format --dot-clang-format-path /opt/compiler-explorer/jakt-trunk/.clang-format --cxx-compiler-path /opt/compiler-explorer/clang-trunk/bin/clang++
-compiler.selfhosted.alias=rustbased
+compiler.selfhosted.options=--runtime-path /opt/compiler-explorer/jakt-trunk/runtime --prettify-cpp-source --clang-format-path /opt/compiler-explorer/clang-trunk/bin/clang-format --dot-clang-format-path /opt/compiler-explorer/jakt-trunk/.clang-format --cxx-compiler-path /opt/compiler-explorer/gcc-12.1.0/bin/g++