asterisk-13.x: clean up compile stage

- Don't add extra TARGET_LDFLAGS for asterisk13-pbx-lua. It is not
  needed anymore (apart from that the module isn't available currently,
  see next commit).
- Stop setting -Wl,-rpath-link in LDFLAGS. There is no point to do that.
- Stop calling specific make targets like version.h; make handles the
  build properly without it.
- Use the default compile routine instead of the custom one.
- Add AST_FORTIFY_SOURCE to MAKE_FLAGS (seen in Debian rules file,
  prevents asterisk's build system to mess with OpenWrt/LEDE flags).
- Remove $(SITE_VARS) (unused)
- Remove $(SDK) from ifneq. The variable prevents the ifneq from
  working on the buildbots. $(SDK) is set there, so the ifneqs that test
  for empty will always be true.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

net/asterisk-13.x/Makefile

@@ -168,7 +168,7 @@ define Package/asterisk13-sounds/install
 	rm -f $(1)/usr/share/asterisk/sounds/vm-*
 endef
 
-ifneq ($(SDK)$(CONFIG_PACKAGE_asterisk13-chan-dahdi),)
+ifneq ($(CONFIG_PACKAGE_asterisk13-chan-dahdi),)
   CONFIGURE_ARGS+= \
 	--with-dahdi="$(STAGING_DIR)/usr" \
 	--with-pri="$(STAGING_DIR)/usr" \
@@ -180,11 +180,9 @@ else
 	--without-tonezone
 endif
 
-TARGET_LDFLAGS+= \
+# Pass CPPFLAGS in the CFLAGS as otherwise the build system will
-	$(if $(CONFIG_PACKAGE_$(PKG_NAME)-pbx-lua),-ldl -lcrypt)
+# ignore them.
-
+TARGET_CFLAGS+=$(TARGET_CPPFLAGS)
-EXTRA_CFLAGS+=$(TARGET_CPPFLAGS)
-EXTRA_LDFLAGS+=$(TARGET_LDFLAGS) -Wl,-rpath-link,$(STAGING_DIR)/usr/lib
 
 CONFIGURE_ARGS+= \
 	--without-execinfo \
@@ -231,6 +229,20 @@ CONFIGURE_ARGS+= \
 CONFIGURE_VARS += \
 	ac_cv_path_ac_pt_CONFIG_LIBXML2=$(STAGING_DIR)/host/bin/xml2-config
 
+MAKE_FLAGS+= \
+	ASTDATADIR="/usr/share/asterisk" \
+	DESTDIR="$(PKG_INSTALL_DIR)"
+
+# show full gcc arguments instead of [CC] and [LD]
+MAKE_FLAGS+= \
+	NOISY_BUILD="yes"
+
+# don't let asterisk mess with build flags
+MAKE_FLAGS+= \
+	AST_FORTIFY_SOURCE="" \
+	DEBUG="" \
+	OPTIMIZE=""
+
 AST_MENUSELECT_OPTS = \
 	--without-newt \
 	--without-curses \
@@ -241,7 +253,7 @@ define Build/Configure
 	(cd $(PKG_BUILD_DIR); \
 		./bootstrap.sh; \
 	);
-	$(call Build/Configure/Default,,$(SITE_VARS))
+	$(call Build/Configure/Default)
 	(cd $(PKG_BUILD_DIR)/menuselect; \
 		./bootstrap.sh; \
 		./configure \
@@ -256,19 +268,7 @@ define Build/Compile
 	$(MAKE) -C "$(PKG_BUILD_DIR)/menuselect" \
 		CFLAGS="$(HOST_CFLAGS) -I$(STAGING_DIR)/host/include/libxml2" \
 		LDFLAGS="$(HOST_LDFLAGS) -lxml2"
-	$(MAKE) -C "$(PKG_BUILD_DIR)" \
+	$(call Build/Compile/Default,all install samples)
-		include/asterisk/version.h \
-		include/asterisk/buildopts.h defaults.h \
-		makeopts.embed_rules
-	ASTCFLAGS="$(EXTRA_CFLAGS) -DLOW_MEMORY"
-	ASTLDFLAGS="$(EXTRA_LDFLAGS)"
-	$(MAKE) -C "$(PKG_BUILD_DIR)" \
-		ASTDATADIR="/usr/share/asterisk" \
-		NOISY_BUILD="yes" \
-		DEBUG="" \
-		OPTIMIZE="" \
-		DESTDIR="$(PKG_INSTALL_DIR)" \
-		all install samples
 endef
 
 define Build/InstallDev