use array-based load_be/le in MD hashes #42

Job	Run time
TLS-Anvil (server)	38m 59s
valgrind	1h 27m 48s
clang-tidy	1h 17m 0s
PQ/T TLS 1.3	10m 51s
Cross (cross-alpha, gcc, ubuntu-24.04)	14m 33s
Cross (cross-hppa64, gcc, ubuntu-24.04)	30m 30s
Cross (cross-m68k, gcc, ubuntu-24.04)	25m 56s
Cross (cross-mips, gcc, ubuntu-24.04)	20m 1s
Cross (cross-ppc32, gcc, ubuntu-24.04)	9m 38s
Cross (cross-sh4, gcc, ubuntu-24.04)	25m 11s
Cross (cross-sparc64, gcc, ubuntu-24.04)	31m 11s
Cross (cross-riscv64, gcc, ubuntu-24.04)	16m 12s
Cross (cross-s390x, gcc, ubuntu-24.04)	23m 43s
Cross (cross-android-arm64-amalgamation, clang, ubuntu-24.04)	4m 18s
Cross (cross-arm64-amalgamation, gcc, ubuntu-24.04)	12m 48s
Cross (emscripten, emcc, macos-14)	50m 34s
	7h 59m 13s

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