./va/va_vpp.h file still has execute bit set

There is travis check added by #419 but currently on master there is `./va/va_vpp.h` that has execute bit set
if I run script manually in my work tree error is raised:
```
$ if [[ -n "$(find -name '*.[ch]' -executable)" ]]; then echo "Error, a source code file(s) has the execute bit set:" >&2; find -name '*.[ch]' -executable; exit 1; fi
Error, a source code file(s) has the execute bit set:
./va/va_vpp.h
```

but on travis error is not triggered, dont know why maybe umask or exit handle, not sure

commit that introduce execute bit on `./va/va_vpp.h` is https://github.com/intel/libva/commit/30c751f7b74c43021f33361c1baf2aa92acd0317 100644 → 100755

I will send PR with fix for mode on file `./va/va_vpp.h` but don't know how to debug travis locally without spamming your build with adding `ls -l va/va_vpp.h` or `stat va/va_vpp.h` lines