internals: fix stripping

Do not try to strip any script.

Previously, only shell scripts were ignored, but when the Java frontend
is installed, it also installs a Python script. So we have to ignore
any "script text executable", and not restrict it to "shell script text
executable".

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 # Default test suite configuration

 # Default DejaGnu configuration

 DG_TOOLNAME = gcc

 DG_TARGET_HOSTNAME = 127.0.0.1

 DG_TARGET_USERNAME = root

 # Default tests

 DG_C_TESTS = 

 DG_CPP_TESTS =