Fix AM_PROG_VALAC version requirement detection. * m4/vala.m4 (AM_PROG_VALAC): Remove `Vala ' from valac --version string before comparing versions. * tests/vala2.test: Require version 0.7.0 for the test. Fixes failures of vala2.test and vala3.test with older valac. Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>