Do all remaining changes necessary for a working build.
Add Makefile.am files in include/... subdirs.
Remove noinst_HEADERS directives from src/*/Makefile.am, but keep the headers
list to feed to move-asn1-header-files.sh.
Adjust all #includes in src/*_common.h and elsewhere. In hnbap_common.h,
separate the ASN.1 "primitive" headers from the others, and include them
without a subdir path, as before.
'make distcheck' checks for out-of-source-tree builds and whether
the distribution tarball includes all source files. This commit
fixes many problems, except some remaining with src/test still
to-be-fixd.