We don't document the header files that define structs/enums/types
that are taken 1:1 from the relevant GSM specifications. So let's avoid
having doxygen generate tons of warnings for related undocumented
members.
Change-Id: I231f78972a015902e4085aa80fcbc04009ae9f13
When building out-of-srcdir, paths such as "src/gsm" will not find any
source files. Since the Doxyfiles are preprocessed, we can prepend
@srcdir@ to fix that.
Signed-off-by: Alex Badea <vamposdecampos@gmail.com>