Revert "detect_cxx_stdlibs: ignore executables."

This reverts commit 1cd636d368c66d1346adc1c38633c8f204c759f4.
q 1.1.1

Closes #25723.
sip 4.15.4

Closes #25730.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
openssl 1.0.1f

Closes #25724.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
libcello 1.1.7

The 1.1.2 package did not build.  1.1.7 incorporates changes to the build system that should now build cleanly (on OSX) going forward.

Closes #25722.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
autojump: if building head, install python modules

Install python modules and original autojump script into autojump's own libexec dir and write an exec script for them. This way `autojump` is the only thing that ends up on in `/usr/local/bin`.

Closes #25729.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>