tests: more meaningful names for some test cases * t/yacc5.sh: Renamed ... * t/yacc-grepping2.sh: ... like this. * t/yacc7.sh: Renamed ... * t/yacc-headers-and-pr47.sh: ... like this. * t/yacc8.sh: Renamed ... * t/yacc-subdir.sh: ... like this. * t/subdir10.sh: Rename ... * t/subdir-env-interference.sh: ... like this. * t/specflg10.sh: Rename ... * t/am-default-source-ext.sh: ... like this. * t/suffix12.sh: Rename ... * t/suffix-custom-subobj.sh: ... like this. * t/suffix13.sh: Rename ... * t/suffix-custom-subobj-and-specflg.sh: ... like this. * t/check3.sh: Rename ... * t/built-sources-check.sh: ... like this. * t/subdirbuiltsources.sh: Rename ... * t/built-sources-subdir.sh: ... like this. * t/bsource.sh: Rename ... * t/no-spurious-install-recursive.sh: ... like this. * t/list-of-tests.mk: Adjust. Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>