doc: do not include src/{common,comp,decomp}/rohc/ in doxygen documentation.
doc: do not include src/{common,comp,decomp}/rohc/ in doxygen documentation.

The src/{common,comp,decomp}/rohc/ directory emulates the rohc/ subdir for
public headers. There is nothing interesting in it.

didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc