libsystemd.a missing symbols on armhf

There are two symptoms to observe here. First is that build-with-static-libsystemd fails on armhf[1]:

2733s autopkgtest [10:52:05]: test build-with-static-libsystemd: [-----------------------
2735s /usr/bin/ld: /tmp/ccRhNQ82.o: in function `main':
2735s uuid-gen.c:(.text+0x20): undefined reference to `sd_id128_randomize'
2735s /usr/bin/ld: uuid-gen.c:(.text+0x5c): undefined reference to `sd_id128_to_string'
2735s collect2: error: ld returned 1 exit status
2735s autopkgtest [10:52:07]: test build-with-static-libsystemd: -----------------------]

Second is this dh_strip warning from the armhf build log[2]:

dh_strip: warning: lto-no-text-in-archive: debian/libsystemd-dev/usr/lib/arm-linux-gnueabihf/libsystemd.a

This is caused by building with -flto=auto, but without -ffat-lto-objects[3], which appears to be enabled for all arches except armhf.

[1] https://autopkgtest.ubuntu.com/results/autopkgtest-mantic/mantic/armhf/s/systemd/20230815_105221_65d03@/log.gz
[2] https://launchpadlibrarian.net/681945377/buildlog_ubuntu-mantic-armhf.systemd_253.5-1ubuntu2_BUILDING.txt.gz
[3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=977596