Build

GHA/curl-for-win: tidy up build configuration, drop artifacts #131

Job	Run time
macOS	19s
Cygwin	1m 53s
Windows	39s
Linux (clang sanitizers, clang, test, clang, -fsanitize=address,undefined,signed-integer-overflow...	30s
Linux (default, valgrind, test-memory)	3m 4s
	6m 25s

Provide feedback