[Tracker] PATCH: Allow disabling all extractors

[Jonatan Pålsson <jonatan palsson pelagicore com>]

Hi list,

I noticed it is not possible to disable some of the extractors
provided with Tracker (such as the extractor for generic text, DVI and
PS). This is a feature I needed, so I added --enable/--disable
switches to the configure.ac script for the extractors not currently
switchable. The default is of course to have these extractors enabled.

If this is of interest, I come bearing patches :)

Allow disabling PNG:
https://github.com/Pelagicore/tracker-ivi/commit/e8f37d0b2cd97bf211cb91d456abdb53b9a12aef

Allow disabling AbiWord:
https://github.com/Pelagicore/tracker-ivi/commit/4b686d60e9344676206d063d818edc581158ace4

Allow disabling DVI:
https://github.com/Pelagicore/tracker-ivi/commit/ac9216f65ee144941df3cf57482535988696a379

Allow disabling MP3:
https://github.com/Pelagicore/tracker-ivi/commit/e638249cd25b6c71847ee385b96b0142641a0335

Allow disabling PS:
https://github.com/Pelagicore/tracker-ivi/commit/9f268c0cf5861d40b9b7996b77a943b11d545dc4

Allow disabling generic text:
https://github.com/Pelagicore/tracker-ivi/commit/d61dd4fd334eeaf772a18681f9060fb462e57878

Allow disabling icon / .ico
https://github.com/Pelagicore/tracker-ivi/commit/dba659e4197588426f036e4dba67be453ca3f044

Also, I added a switch to not install the Tracker graphics (which are
only interesting for systems capable of displaying graphics):
https://github.com/Pelagicore/tracker-ivi/commit/1d8f6477e8a1ef699069b3ef4888dc865f33127f


I could also instead post the patches as diffs (or one big diff) to
the mailing list if this is preferable.
--
Regards,
Jonatan Pålsson

Pelagicore AB
Ekelundsgatan 4, 6th floor, SE-411 18 Gothenburg, Sweden