External projects were using non-public header ares_dns.h, make public again (#376)

It appears some outside projects were relying on macros in ares_dns.h, even though it doesn't appear that header was ever meant to be public.  That said, we don't want to break external integrators so we should distribute this header again.

Fix By: Fabrice Fontaine (@ffontaine)

Makefile.m32

@@ -42,7 +42,7 @@ tags:
 %.exe: %.o src/tools/ares_getopt.o $(LIB)
 	$(LD) $(LDFLAGS) -o $@ $^ $(LIBS)
 
-$(OBJLIB): include/ares.h src/lib/ares_dns.h include/ares_build.h
+$(OBJLIB): include/ares.h include/ares_dns.h include/ares_build.h
 
 .c.o:
 	$(CC) $(CFLAGS) -o $@ -c $<

include/CMakeLists.txt

@@ -3,6 +3,6 @@ CONFIGURE_FILE (ares_build.h.cmake ${PROJECT_BINARY_DIR}/ares_build.h)
 
 # Headers installation target
 IF (CARES_INSTALL)
-	SET (CARES_HEADERS ares.h ares_version.h "${PROJECT_BINARY_DIR}/ares_build.h" ares_rules.h)
+	SET (CARES_HEADERS ares.h ares_version.h "${PROJECT_BINARY_DIR}/ares_build.h" ares_rules.h ares_dns.h)
 	INSTALL (FILES ${CARES_HEADERS} COMPONENT Devel DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 ENDIF ()

include/Makefile.am

@@ -2,6 +2,6 @@ AUTOMAKE_OPTIONS = foreign nostdinc 1.9.6
 ACLOCAL_AMFLAGS = -I m4 --install
 
 # what headers to install on 'make install':
-include_HEADERS = ares.h ares_version.h ares_build.h ares_rules.h
+include_HEADERS = ares.h ares_version.h ares_build.h ares_rules.h ares_dns.h
 
 EXTRA_DIST = ares_build.h.cmake ares_build.h.in ares_build.h.dist CMakeLists.txt