openssl: always build apps

openssl: always build apps

Now that building the openssl binary without MMU is supported, the only
reason left for not building apps if the openssl binary is disabled is
to save build time. Moreover, the commit
720893b62510438237b9923d744dd079ddb4f67d "openssl: disable apps for
NOMMU", which added this behavior, had a side effect: the scripts from
apps (CA.pl, CA.sh and tsget) and the default configuration file
(openssl.cnf) were no longer installed, which is not advertized by the
BR2_PACKAGE_OPENSSL_BIN option. CA.pl and CA.sh use the openssl binary,
so not installing them without the latter makes sense. But tsget does
not use the openssl binary, and openssl.cnf can be used by libcrypto, so
it is preferable to handle BR2_PACKAGE_OPENSSL_BIN like before the
commit mentioned above, i.e. to always build and install apps and to
just remove the openssl binary afterwards if needed.

This is what the current commit does, but installing only the helper
scripts having their dependencies (perl or the openssl binary)
satisfied. The help text is updated accordingly.

Signed-off-by: Benoît Thébaudeau <benoit@wsystem.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>