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Makefile: Use hg log instead of hg id --debug, which has unstable output
release-2.x.y
2016-10-05, dx

478cf4acf83d

Makefile: Use hg log instead of hg id --debug, which has unstable output

See comments in http://stackoverflow.com/a/2485923/2195033

Also the fact that it was just broken for me - it threw debug info to stdout
("ignoring untrusted configuration option") when running 'sudo make install',
which ended up in package_revision_raw.txt, which broke the build.

/** @page imgstore-signals Image Store Signals

@signals

@signal image-deleting

@endsignals

@see imgstore.h

<hr>

@signaldef image-deleting

@signalproto

char *(*image_deleting)(const PurpleStoredImage *img);

@endsignalproto

@signaldesc

Emitted when a #PurpleStoredImage is about to be destroyed. This allows

for what amounts to weak references. Code can hold onto a pointer to

the PurpleStoredImage without actually "holding" a reference. They can

then use a signal handler to let them know when their img is about to

be destroyed.

@param img The image about to be destroyed.

@note It's not possible to purple_imgstore_ref() img to save it.

@endsignaldef

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