The authentication_ldap_sasl_client plugin is a client-side plugin,
and should not be linked with server-side utilities.
Add a new argument CLIENT_ONLY to MYSQL_ADD_PLUGIN

Details:
client/mysql.cc
Fix some 'may be used uninitialized' warnings.

mysql-test/lib/My/SafeProcess/CMakeLists.txt
Remove obsolete handling of stlport, this can no longer be used for
building the server.

mysys/my_conio.c
mysys/my_windac.c
mysys/my_winfile.c
Explicitly #include "my_sys.h" which is needed in order to build.
my_sys.h is implicitly included by "mysys_priv.h" in a default build,
but not in a client-build, which does not have HAVE_PSI_INTERFACE defined.

storage/ndb/mcc/CMakeLists.txt
Skip building for client-only build, as this is part of NDB server.

storage/ndb/src/CMakeLists.txt
NDBCLIENT_SYSTEM_LIBS can be empty on some platforms, so check
contents before doing LIST(REMOVE_DUPLICATES)

storage/ndb/src/mgmsrv/ConfigInfo.cpp
Insert whitespace between text literals and preprocessor tokens.
Modern compilers will otherwise reject to do the token concatenation.

Change-Id: I0d993b131afe2f4ccbc5b1bedfa3da071d99f6a8