Windows 10 / FLTK 1.4 / Built locally with Microsoft Visual Studio 2019

I've been having problems with fl_filename_absolute on Windows. Here is a sample:

    // verify our working directory is "e:/temp"
    char buff[100];
    char* cwd = fl_getcwd(buff, sizeof(buff));
    assert(!strcmp(cwd, "E:\\temp"));

    // this one works
    fl_filename_absolute(buff, sizeof(buff), "./log.txt");
    assert(!strcmp(buff, "E:/temp/log.txt"));

    // this one fails [result is "E:/temp/..\\log.txt"
    fl_filename_absolute(buff, sizeof(buff), ".\\log.txt");
    assert(!strcmp(buff, "E:/temp/log.txt"));    

Stepping into the fl_filename_absolute() call, I find that any invocation of isdirsep inside Fl_WinAPI_System_Driver.cxx is using the version of isdirsep in filename_absolute.cxx. The latter does not accept the double-backslash.

My fix was to declare each instance of isdirsep to be static. Then Fl_WinAPI_System_Driver::filename_absolute would use the correct version of isdirsep.

As of this writing, I have not yet tested the change on Linux.

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