2.54.0-rc1 NO_WRITEV=Nope does not work

With a completely clean build, we are getting writev() being used anyway on NonStop:

/usr/coreutils/bin/make NO_TCLTK=NoThanks NO_WRITEV=Nope V=1 prefix=/usr/local-ssl3.5 CFLAGS=-g -O2 -D_LARGEFILE64_SOURCE=1 -D_FILE_OFFSET_BITS=64 -Winline -I/usr/local-ssl3.5/include -I/usr/coreutils/include -I/usr/tandem/xml/T0625L01_AAE/include LDFLAGS=-D_LARGEFILE64_SOURCE=1 -D_FILE_OFFSET_BITS=64 /usr/coreutils/lib/libz.a -L/usr/local-ssl3.5/lib -L/usr/coreutils/lib -L/usr/tandem/xml/T0625L01_AAE/lib SHELL=/usr/coreutils/bin/bash GIT_VERSION=2.54.0.rc1

Down to the first instance:

Cloning into bare repository 'clone.git'... remote: Enumerating objects: 629, done. fatal: writev error: Invalid function argument fetch-pack: unexpected disconnect while reading sideband packet fatal: early EOF fatal: fetch-pack: invalid index-pack output not ok 25 - clone from bitmapped repository # #                       rm -fr clone.git && #                       git clone --no-local --bare . clone.git && #                       git rev-parse HEAD >expect && #                       git --git-dir=clone.git rev-parse HEAD >actual && #                       test_cmp expect actual #

Did I mess this up?

-- Brief whoami: NonStop&UNIX developer since approximately UNIX(421664400) NonStop(211288444200000000) -- In real life, I talk too much.