let's not assume that char is signed (its signedness is not defined).
The server was also affected by the wrong typedef.


include/my_global.h:
  Fix for Bug#6024 "Test "client_test" fails in 4.1.6-gamma build (1)":
  let's not assume that char is signed (its signedness is not defined).
libmysql/libmysql.c:
  Fix for Bug#6024 "Test "client_test" fails in 4.1.6-gamma build (1)":
  let's not assume that char is signed (its signedness is not defined).