Since doxygen 1.8.16, MSCGEN_PATH and PERL_PATH are obsolete:
MSCGEN_PATH:
https://github.com/doxygen/doxygen/commit/
873e0ccfbe43ef98d4858beb08eef37631ae3cf6
PERL_PATH:
https://github.com/doxygen/doxygen/commit/
6d1535c38fe6bdaa2a00fff0e7e43774a740a4ce
I don't think that the notmuch builds ever depended on them in the
first place, and including them in the default config yields the
following two warnings:
```
doxygen ./doc/doxygen.cfg
warning: Tag 'PERL_PATH' at line 267 of file './doc/doxygen.cfg' has become obsolete.
To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u"
warning: Tag 'MSCGEN_PATH' at line 272 of file './doc/doxygen.cfg' has become obsolete.
To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u"
```
Remove them to avoid the warnings.
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
ALLEXTERNALS = NO
EXTERNAL_GROUPS = NO
EXTERNAL_PAGES = NO
-PERL_PATH = /usr/bin/perl
#---------------------------------------------------------------------------
# Configuration options related to the dot tool
#---------------------------------------------------------------------------
CLASS_DIAGRAMS = NO
-MSCGEN_PATH =
HIDE_UNDOC_RELATIONS = YES
HAVE_DOT = NO
DOT_NUM_THREADS = 0