Freebsd build fixes.

[inkdot7]

Note: I'm having bad results with ccache.

LD build_x86_64-unknown-freebsd14.3_19.1.7_debug/tests
/usr/local/bin/ld: ../ucesb/hbook/ext_data_clnt.o: undefined reference to symbol '_ZNSt9bad_allocC1Ev@@CXXRT_1.0'
/usr/local/bin/ld: /lib/libcxxrt.so.1: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

possibly only when being used for linking.
Not using it for anything else, so uninstalled it again...