VFS: fixup for no-vfs builds

[metux]

This is the second take.

I'm adding several patches from #1818 and reworked a bit,
for easier review. The #1818 branch will be rebased as soon
this one is merged.

branch:1931_no_vfs_fixups

[andrew_b]

I belive that a lot of comits, realated to removed src/vfsdummy.h, can be sqaushed to single commit for easier review.

[metux]

Replying to andrew_b:

I belive that a lot of comits, realated to removed src/vfsdummy.h, can be sqaushed to single commit for easier review.

I've did it this way for easier review ;-o

[andrew_b]

Replying to metux:

I've did it this way for easier review ;-o

You move content of src/vfsdummy.h into vfs/vfs.h and then remove src/vfsdummy.h. I think it can be maken with single commit but not with 30 commits.

[metux]

Replying to andrew_b:

Replying to metux:

I've did it this way for easier review ;-o

You move content of src/vfsdummy.h into vfs/vfs.h and then remove src/vfsdummy.h. I think it can be maken with single commit but not with 30 commits.

I did it this way, since I had been asked to do so.
Actually, if we've got some changes in vfsdummy.h before this branch is merged, we can catch it *much* easier (minimize the chance that somethings slips through).

We could squash'em together after approval, right before merge.

[andrew_b]

Replying to metux:

We could squash'em together after approval, right before merge.

OK, will not forget that.

[andrew_b]

Merged to master.

git log --pretty=oneline 3e42f64..49c8644

[slavazanko]

4.7.0-stable:

git diff 22d328f609f81ee07c414b45dd6b193f9a3ab1b7^{...8df60dac4f675bc4ead165f8daf1f4002506cd57}