jasper: disable -pedantic-errors

The -pedantic-errors gcc option turns -pedantic warnings into errors. This
mostly affects older gcc versions that default to the ISO90 C standard. Use
the --disable-strict configure option to remove -pedantic-errors.

Fixes:
http://autobuild.buildroot.net/results/191/191f80779df1a9e6f832106e6c4bdf601e2a9893/
http://autobuild.buildroot.net/results/1fe/1febccc7215814490fa3c776b34bc367363afe39/
http://autobuild.buildroot.net/results/a6f/a6f9bfec3406fc21b130f1669e3534651b9c9596/



Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>