build: broken CMake *flags output #31482
Description
Seen in CI runs, i.e https://cirrus-ci.com/task/5616358949388288?logs=configure#L309:
C++ compiler flags .................... -O2 -g -std=c++20 -fPIC -fdebug-prefix-map=/tmp/cirrus-ci-build/bitcoin-core/src=. -fmacro-prefix-map=/tmp/cirrus-ci-build/bitcoin-core/src=. -Werror $<$<COMPILE_LANG_AND_ID:CUDA,NVIDIA>:SHELL:-Xcompiler -pthread> $<$<AND:$<NOT:$<COMPILE_LANG_AND_ID:CUDA,NVIDIA>>,$<NOT:$<COMPILE_LANGUAGE:Swift>>>:-pthread> -Wall -Wextra -Wgnu -Wformat -Wformat-security -Wvla -Wshadow-field -Wthread-safety-Werror $<$<COMPILE_LANG_AND_ID:CUDA,NVIDIA>:SHELL:-Xcompiler -pthread> $<$<AND:$<NOT:$<COMPILE_LANG_AND_ID:CUDA,NVIDIA>>,$<NOT:$<COMPILE_LANGUAGE:Swift>>>:-pthread> -Wall
Haven't checked if there is a (silent) effect on the build, but in any case, this output is broken.