Some testcase (the ones related to sparse-llvm) are disabled if the needed support is not present. This is done by checking the name of the command used by the testcase. The previous possible presence of './' before the command meant that the command was checked via the 'basename' command, which need to ne fork+execed. Since the './' have now been stripped from all command names this is no more needed. Change this by comparing directly the command name. This speedup the testsuite by another 6%. Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>