libserial: prevent documentation from being build
If docbook2pdf is present on the host, the documentation is built, no matter all the --disable-doc* But forcing ac_cv_prog_DOCBOOK2PDF to no tells configure that docbook2pdf is absent, and thus the documentation is not built. Signed-off-by:Richard Genoud <richard.genoud@gmail.com> Signed-off-by:
Peter Korsgaard <jacmet@sunsite.dk>
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