Build-depend on libharfbuzz-dev for PDF generation with fop

Benjamin Drungrequested to merge
bdrung/scons:master into master

SCons fails to build with:

> scons: Building targets ...
[...]
> /usr/bin/fop -fo scons-scons-time.fo -pdf scons-scons-time.pdf
> Exception in thread "main" java.lang.UnsatisfiedLinkError: /usr/lib/jvm/java-17-openjdk-amd64/lib/libfontmanager.so: libharfbuzz.so.0: cannot open shared object file: No such file or directory

/usr/lib/jvm/java-17-openjdk-amd64/lib/libfontmanager.so is shipped by openjdk-17-jre-headless which recommends libharfbuzz0b (>= 1.2.6).

Closes: #1067317

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