[Bug 267006] Make clean tests fail on FreeBSD 12.3-STABLE machine

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267006

            Bug ID: 267006
           Summary: Make clean tests fail on FreeBSD 12.3-STABLE machine
           Product: Base System
           Version: 12.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: testing@FreeBSD.org
          Reporter: admin@support.od.ua

Freshly installed VM machine FreeBSD 12.3-STABLE (2GB RAM, x6 CPU core) in
Virtualbox running on Windows 10.

# env | grep -i shell
SHELL=/bin/csh

# uname -a
FreeBSD vb-12-3 12.3-STABLE FreeBSD 12.3-STABLE #0 r371020M: Tue Nov 16
03:13:07 EET 2021     root@vb-12.3:/usr/obj/usr/src/amd64.amd64/sys/vb-12.3.1 
amd64


env ASSUME_ALWAYS_YES=yes pkg update
pkg update
pkg install -y ca_root_nss gitup
sed -i '.backup' "s,stable/12,stable/13," /usr/local/etc/gitup.conf
gitup stable

# Target Directory: /usr/src
# Have: 4ec4cd727bd0f25240e017faa50da6635b8bc442
# Low memory mode: Yes
# Want: 4ec4cd727bd0f25240e017faa50da6635b8bc442
# Branch: stable/13

cd /usr/src
make clean

```
... 
===> usr.bin/bmake/tests/variables/t0 (clean)
rm -f legacy_test legacy_test.tmp Kyuafile Kyuafile.tmp
rm -rf checkdir
rm -f Kyuafile Kyuafile.tmp
rm -rf checkdir
rm -f Kyuafile Kyuafile.tmp
rm -rf checkdir
===> usr.bin/bmake/unit-tests (clean)
make[4]: "/usr/src/usr.bin/bmake/unit-tests/Makefile" line 446: Malformed
conditional (${.SHELL:T} == "ksh")
make[4]: "/usr/src/usr.bin/bmake/unit-tests/Makefile" line 775: Malformed
conditional (${.SHELL:T} == "ksh")
make[4]: Fatal errors encountered -- cannot continue
make[4]: stopped in /usr/src/usr.bin/bmake/unit-tests
*** Error code 1
*** Error code 1
*** Error code 1
*** Error code 1
```

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