make: install-headers: rust-bindings.h

rust-bindings.h was not being installed with "make install-headers",
and its now pulled in by a header used for plugin support, so make
sure its installed.

We first attempt to install the "dist" version if exists, otherwise
install the "gen" one. Also install the "gen" even if the "dist" one
exists, as its going to be newer.

src/Makefile.am

@@ -1174,6 +1174,12 @@ install-headers:
 	for header in $(noinst_HEADERS); do \
 		$(INSTALL_DATA) $$header "$(DESTDIR)${includedir}/suricata"; \
 	done
+	if test -e ../rust/dist/rust-bindings.h; then \
+		$(INSTALL_DATA) ../rust/dist/rust-bindings.h "$(DESTDIR)${includedir}/suricata"; \
+	fi
+	if test -e ../rust/gen/rust-bindings.h; then \
+		$(INSTALL_DATA) ../rust/gen/rust-bindings.h "$(DESTDIR)${includedir}/suricata"; \
+	fi
 
 # Until we can remove autoconf.h from our headers, we need to to
 # provide this for library/plugin users.