perl.h: remove UNION_ANY_DEFINITION support #13665

Job	Run time
involved_authors_debug	8s
Sanity: Linux -Dusethreads	10m 34s
cygwin	33m 49s
dist-modules (latest)	2m 20s
Test dist/ modules on MacOS system perl	4m 32s
ASAN (-Accflags=-DPURIFY)	21m 9s
dist-modules (5.24)	2m 20s
ASAN (-DDEBUGGING)	22m 29s
install	10m 23s
ASAN (-Dusethreads)	22m 29s
dist-modules (5.10)	2m 11s
linux (-Uusethreads)	9m 24s
dist-modules (5.8)	2m 19s
linux (-Duseshrplib -Dusequadmath -Dusecbacktrace -Dusethreads)	11m 12s
linux i386/ubuntu (-Dusedevel)	15m 37s
linux (-Duserelocatableinc)	9m 34s
Windows mingw64	34m 53s
linux (-Dcc='clang')	10m 0s
minitest	3m 38s
PERL_UNICODE (-Uusethreads)	8m 22s
linux (-Dcc='g++')	9m 46s
macOS (Monterey) 12 (-Uusethreads)	11m 38s
PERL_UNICODE (-Dusethreads -Accflags=-DPURIFY -Dcc='gcc -fsanitize=address' -Dld='gcc -fsanitize=...	23m 24s
linux (-Accflags=-DSILENT_NO_TAINT_SUPPORT)	9m 28s
macOS (Monterey) 12 (-Duseithreads -Duseshrplib)	13m 42s
Windows msvc142	52m 19s
linux (-Accflags=-DNO_TAINT_SUPPORT)	9m 16s
linux (-DDEBUGGING -Accflags=-DPERL_RC_STACK)	9m 57s
linux (-Uusedl)	9m 12s
	6h 26m 5s

Provide feedback