Setup buildbots for continuous integration

[Didier Barvaux]

To avoid problems such as bug #800835, please setup buildbots for continuous integration. They could build the library with all warnings on (and failure on all warnings) and run the tests.

First targets could be:
 - Linux x86 GCC 4.1.x
 - Linux x86 GCC 4.3.x
 - Linux x86 GCC 4.4.x
 - Linux x86 GCC 4.5.x
 - Linux x86 GCC 4.6.x
 - Linux x86-64 GCC 4.1.x
 - Linux x86-64 GCC 4.3.x
 - Linux x86-64 GCC 4.4.x
 - Linux x86-64 GCC 4.5.x
 - Linux x86-64 GCC 4.6.x

Later one could add targets for BSD systems and other compilors.

[Didier Barvaux (didier-barvaux)]

Open Build Service (OBS, http://buildservice.org) may be an option.

[Didier Barvaux (didier-barvaux)]

To avoid problems such as the one described in bug #886523 entitled "Build of tests and apps fails with support for shared libs disabled", please build the library with and without the --disabled-shared option on all buildbots.

[Didier Barvaux (didier-barvaux)]

To avoid problems such as bug #889203 or bug #888287, please build the library on ARM and run its tests.

[Didier Barvaux (didier-barvaux)]

A continuous integration platform was setup. See FAQ #1799.

[Didier Barvaux (didier-barvaux)]

The 1.3.x branch is tested by the continuous platform.

[Didier Barvaux (didier-barvaux)]

The 1.2.x branch is tested by the continuous platform.