Revert CMake hacks for e2k in Externals/LuaJIT-proj #5254

Job	Run time
Windows Debug x64 (msvc)	6m 19s
FreeBSD Debug x86_64	6m 55s
Ubuntu Debug amd64 (gcc)	5m 45s
Windows Debug x86 (msvc)	6m 8s
FreeBSD Release x86_64	9m 36s
Ubuntu Release amd64 (gcc)	6m 36s
Windows Mixed x64 (msvc)	5m 29s
OpenBSD Debug x86_64	10m 43s
Ubuntu Debug amd64 (clang)	7m 25s
Windows Mixed x86 (msvc)	4m 30s
OpenBSD Release x86_64	9m 30s
Ubuntu Release amd64 (clang)	9m 41s
Windows Release x64 (msvc)	10m 45s
NetBSD Debug x86_64	11m 13s
Ubuntu Debug arm64 (gcc)	4m 43s
Windows Release x86 (msvc)	9m 33s
NetBSD Release x86_64	9m 54s
Ubuntu Release arm64 (gcc)	5m 15s
Windows Release Master Gold x64 (msvc)	8m 55s
Alpine Debug x86_64 (gcc)	7m 2s
Windows Release Master Gold x86 (msvc)	8m 23s
Alpine Release x86_64 (gcc)	24m 8s
Alpine Debug x86 (gcc)	7m 15s
Alpine Release x86 (gcc)	27m 22s
Fedora Debug x86_64 (gcc)	6m 32s
Fedora Release x86_64 (gcc)	7m 13s
macOS 13 Debug x86_64 (clang)	6m 33s
macOS 13 Release x86_64 (clang)	10m 56s
macOS 15 Debug arm64 (clang)	4m 35s
macOS 15 Release arm64 (clang)	5m 26s
	4h 24m 20s

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