Decrease vm.mmap_rnd_bit to prevent ASLR ASAN issues #1657

Job	Run time
config	4s
fuzz smoke test	6s
win+VS build	0s
win build	15s
documentation	7s
linux32 (daald/ubuntu32:xenial)	42s
linux-musl (alpine)	14s
pedantic (fedora)	13s
sparse	8s
static-analysis	4s
linux-asan-ubsan (ubuntu-latest)	41s
linux-gcc (ubuntu-20.04)	7s
linux-gcc-default (ubuntu-latest)	3s
linux-leaks (ubuntu-latest)	5s
linux-reftable (ubuntu-latest)	6s
linux-reftable-leaks (ubuntu-latest)	8s
linux-sha256 (ubuntu-latest)	5s
linux-TEST-vars (ubuntu-20.04)	5s
win+VS test	0s
osx-clang (macos-13)	8s
osx-gcc (macos-13)	9s
osx-reftable (macos-13)	8s
win test	0s
	3m 38s

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