.c files (the IBM Visual Age C compiler aborts with a syntax error
   on these)


libmysql/dll.c:
   - replaced C++-style comment with the proper syntax for .c files
     (the IBM Visual Age C compiler aborts with a syntax error on these)
libmysql/libmysql.c:
   - replaced C++-style comment with the proper syntax for .c files
     (the IBM Visual Age C compiler aborts with a syntax error on these)
mysys/my_getopt.c:
   - replaced C++-style comment with the proper syntax for .c files
     (the IBM Visual Age C compiler aborts with a syntax error on these)
sql/net_serv.cc:
   - replaced C++-style comment with the proper syntax for .c files
     (the IBM Visual Age C compiler aborts with a syntax error on these)
strings/ctype-bin.c:
   - replaced C++-style comment with the proper syntax for .c files
     (the IBM Visual Age C compiler aborts with a syntax error on these)
tests/client_test.c:
   - replaced C++-style comment with the proper syntax for .c files
     (the IBM Visual Age C compiler aborts with a syntax error on these)