AppVeyor: disable x86 Windows builds (don't worry, x86 is still suppo… #4990

Job	Run time
Windows Debug x64 (msvc)	5m 52s
Windows Debug x86 (msvc)	5m 30s
Ubuntu Debug amd64 (gcc)	6m 15s
Windows Mixed x64 (msvc)	6m 0s
FreeBSD Debug x86_64	6m 48s
Ubuntu Release amd64 (gcc)	6m 30s
FreeBSD Release x86_64	9m 56s
Windows Mixed x86 (msvc)	5m 44s
Ubuntu Debug amd64 (clang)	6m 33s
OpenBSD Debug x86_64	11m 4s
Windows Release x64 (msvc)	10m 32s
Ubuntu Release amd64 (clang)	9m 50s
OpenBSD Release x86_64	9m 40s
Windows Release x86 (msvc)	9m 34s
Alpine Debug x86_64 (gcc)	6m 34s
NetBSD Debug x86_64	10m 33s
Windows Release Master Gold x64 (msvc)	9m 14s
Alpine Release x86_64 (gcc)	9m 24s
Windows Release Master Gold x86 (msvc)	8m 39s
Alpine Debug x86 (gcc)	7m 38s
NetBSD Release x86_64	9m 5s
Alpine Release x86 (gcc)	9m 52s
Fedora Debug x86_64 (gcc)	21m 58s
Fedora Release x86_64 (gcc)	14m 58s
macOS 13 Debug x86_64 (clang)	6m 44s
macOS 13 Release x86_64 (clang)	11m 16s
macOS 14 Debug arm64 (clang)	5m 26s
macOS 14 Release arm64 (clang)	7m 28s
macOS 15 Debug arm64 (clang)	4m 15s
macOS 15 Release arm64 (clang)	5m 12s
	4h 18m 4s

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