Fix error computing signal level in getfile2.F90.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/map65@1015 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
to enable compiling MAP65.EXE under Windows, using gcc and g95.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/map65@594 ab8295b8-cf94-4d9e-aec4-7959e3be5d79