[Bug 793103] v4l2: compilation failure with mmap/mmap64 signature miss-match

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793103

--- Comment #38 from haihao.xiang at intel.com ---
Both <sys/types.h> and <sys/mman.h> define off_t in the same way on Ubuntu
17.10

#ifndef __off_t_defined
# ifndef __USE_FILE_OFFSET64
typedef __off_t off_t;
# else
typedef __off64_t off_t;
# endif
# define __off_t_defined
#endif

The preprocessor output shows off_t is not defined when off_t is used in the
first place, I may attach the preprocessor output if you need it. 

The issue still exists even if I reinstalled libc6-dev.

The error in comment #36 disappears if I included <sys/types.h> or <sys/mman.h>
before gstv4l2object.h in gstv4l2allocator.c, but another error is exposed when
compiling gstv4l2colorbalance.c

  CC       libgstvideo4linux2_la-gstv4l2colorbalance.lo
In file included from gstv4l2colorbalance.h:30:0,
                 from gstv4l2colorbalance.c:29:
gstv4l2object.h:197:17: error: unknown type name ‘off_t’; did you mean
‘__off_t’?
       gint fd,  off_t offset);
                 ^~~~~
                 __off_t


So it would be better to include <sys/types.h> or <sys/mman.h> in
gstv4l2object.h

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