maint: fix syntax-check sc_prohibit_int_ijk exclude rule

Fix the regex for excluding files for this syntax-rule.  The rule "include/"
will not work, because we are matching the whole line like this
"^(...|include/|...)$ so we need to use "include/libvirt/libvirt.+".  The second
issue is that we are using only one '$' but there should be two of those at the
end.  The last small adjustment is to escape dots '.' so it match only dot.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>
(cherry picked from commit a94efa50)

cfg.mk

@@ -1218,7 +1218,7 @@ exclude_file_name_regexp--sc_prohibit_include_public_headers_brackets = \
   ^(tools/|examples/|include/libvirt/(virterror|libvirt(-(admin|qemu|lxc))?)\.h$$)
 
 exclude_file_name_regexp--sc_prohibit_int_ijk = \
-  ^(src/remote_protocol-structs|src/remote/remote_protocol.x|cfg.mk|include/)$
+  ^(src/remote_protocol-structs|src/remote/remote_protocol\.x|cfg\.mk|include/libvirt/libvirt.+)$$
 
 exclude_file_name_regexp--sc_prohibit_getenv = \
   ^tests/.*\.[ch]$$