Remove more of unused sources from contrib/tools/m4

commit_hash:2b8258960af9aefb0e3ae017ea118a2ea9b435b0

Author: georgthegreat

build/sysincl/misc-win.yml

@@ -99,11 +99,9 @@
   - fcntl.h:       contrib/tools/m4/lib/platform/win64/fcntl.h
   - langinfo.h:    contrib/tools/m4/lib/platform/win64/langinfo.h
   - locale.h:      contrib/tools/m4/lib/platform/win64/locale.h
-  - math.h:        contrib/tools/m4/lib/platform/win64/math.h
   - sched.h:       contrib/tools/m4/lib/platform/win64/sched.h
   - signal.h:      contrib/tools/m4/lib/platform/win64/signal.h
   - spawn.h:       contrib/tools/m4/lib/platform/win64/spawn.h
-  - stdbool.h:     contrib/tools/m4/lib/platform/win64/stdbool.h
   - sys/stat.h:    contrib/tools/m4/lib/platform/win64/sys/stat.h
   - sys/time.h:    contrib/tools/m4/lib/platform/win64/sys/time.h
   - sys/wait.h:    contrib/tools/m4/lib/platform/win64/sys/wait.h