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

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 fails: the result is "E:/temp/.."
    fl_filename_absolute(buff, sizeof(buff), "..");
    assert(!strcmp(buff, "E:/");

The problem is that the loop logic in filename_absolute fails to account for a ".." with no following directory separator.

Changing this line:
if (start[1]=='.' && isdirsep(start[2])) {
to this:
if (start[1] == '.' && (isdirsep(start[2]) || !start[2])) {
gives the correct results.

I've tested this on Windows but looking at the code in filename_absolute.cxx, the problem will occur there as well.

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