The do_install_ptest_base function uses 'type -t' command to check
whether do_install_ptest is a function and acts correspondingly.
However, the 'type' command is a shell builtin and its behavior is
not all the same across Linux distros. On ubuntu, if we use #!/bin/sh
as the interpreter for the scripts, as in the case of our intermediate
scripts, the '-t' option for the 'type' command is not supported. So
the check always fails and the do_install_ptest function, even if defined,
is not run.
The same problem also applies to the do_configure_ptest_base and the
do_compile_ptest_base functions.
This patch fixes this problem by avoiding using the 'type' builtin command.
