[cvs-nhc98] patch applied (hat): Testing for the Prelude should use entire string not prefix.

[Malcolm Wallace]

Mon Jun 18 04:05:35 PDT 2001  malcolm
  * Testing for the Prelude should use entire string not prefix.
    Previously, "PreludeExtra" for instance was permitted to belong
    to the Prelude.

    M ./src/compiler98/OsOnly.hs -1 +1