Allocate 16k scratch on heap #4535

Job	Run time
grpc	29m 23s
haproxy	3m 10s
tcpdump	1m 51s
ntp	3m 29s
tpm2-tss	4m 28s
bind9	5m 6s
OpenLDAP	17m 45s
openvpn2-6	4m 54s
nmap	2m 24s
Python main	3m 50s
Python releases (FIPS=0 OPENSSL_IN_CRT=0)	14m 35s
socat	5m 25s
strongswan	3m 3s
Python releases (FIPS=1 OPENSSL_IN_CRT=0)	13m 1s
trousers	1m 24s
Python releases (FIPS=0 OPENSSL_IN_CRT=1)	14m 14s
Python releases (FIPS=1 OPENSSL_IN_CRT=1)	13m 5s
amazon-corretto-crypto-provider	22m 24s
libevent	28m 49s
openvpnMaster	4m 30s
	3h 16m 50s

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