meminfo: Add slab_reclaimable to MemAvailable #292

Job	Run time
Upgrade test (gcc, fuse3, ubuntu-24.04, stable-5.0)	46s
Test suite (x86_64) (gcc, fuse, ubuntu-22.04)	28s
Upgrade test (gcc, fuse3, ubuntu-24.04, stable-6.0)	2m 2s
Test suite (aarch64) (gcc, fuse, ubuntu-22.04)	1m 50s
Test suite (x86_64) (gcc, fuse, ubuntu-24.04)	33s
Upgrade test (gcc, fuse3, ubuntu-24.04, main)	47s
Test suite (x86_64) (gcc, fuse3, ubuntu-22.04)	30s
Test suite (aarch64) (gcc, fuse, ubuntu-24.04)	59s
Test suite (x86_64) (gcc, fuse3, ubuntu-24.04)	35s
Test suite (aarch64) (gcc, fuse3, ubuntu-22.04)	1m 47s
Test suite (x86_64) (clang, fuse, ubuntu-22.04)	33s
Test suite (aarch64) (gcc, fuse3, ubuntu-24.04)	58s
Test suite (x86_64) (clang, fuse, ubuntu-24.04)	38s
Test suite (aarch64) (clang, fuse, ubuntu-22.04)	1m 57s
Test suite (x86_64) (clang, fuse3, ubuntu-22.04)	30s
Test suite (aarch64) (clang, fuse, ubuntu-24.04)	1m 18s
Test suite (x86_64) (clang, fuse3, ubuntu-24.04)	3m 25s
Test suite (aarch64) (clang, fuse3, ubuntu-22.04)	1m 56s
Test suite (aarch64) (clang, fuse3, ubuntu-24.04)	1m 16s
	22m 48s

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