fileset: use filectx.isbinary() to filter out binaries in eol()
Since LFS stores the binary attribute in the pointer file, this means that the
file doesn't need to be downloaded in order to be skipped. This function also
catches an IOError if the data can't be loaded in the non-LFS case.
I wonder if it's worth storing the unix/dos attributes in the pointer file as
well, though I'd expect LFS files to be binary most of the time.
Test issue2761
$ hg init
$ touch to-be-deleted
$ hg add
adding to-be-deleted
$ hg ci -m first
$ echo a > to-be-deleted
$ hg ci -m second
$ rm to-be-deleted
$ hg diff -r 0
Same issue, different code path
$ hg up -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ touch does-not-exist-in-1
$ hg add
adding does-not-exist-in-1
$ hg ci -m third
$ rm does-not-exist-in-1
$ hg diff -r 1