include: add scons.mk from packages feed.

smart-manager requires scons for compilation. Include the scons.mk helper
from the packages feed to keep dependencies isolated to this feed.

Author: Morse Micro

include/scons.mk

@@ -0,0 +1,29 @@
+# Originally this scons.mk lived in the openwrt $INCLUDE_DIR
+# someone decided to move it into the packages feed.
+# While I would love to just include the Makefile from the packages
+# feed, I am aiming to avoid any cross-feed dependencies, so am
+# opting to just duplicate it here.
+
+export PLATFORM=posix
+
+SCONS_VARS = \
+	CC="$(TARGET_CC_NOCACHE)" \
+	CXX="$(TARGET_CXX_NOCACHE)" \
+	CFLAGS="$(TARGET_CFLAGS) $(EXTRA_CFLAGS)" \
+	CXXFLAGS="$(TARGET_CXXFLAGS) $(EXTRA_CXXFLAGS)" \
+	CPPFLAGS="$(TARGET_CPPFLAGS) $(EXTRA_CPPFLAGS)" \
+	LDFLAGS="$(TARGET_LDFLAGS) $(EXTRA_LDFLAGS)" \
+	DESTDIR="$(PKG_INSTALL_DIR)"
+
+define Build/Configure/Default
+	(cd $(PKG_BUILD_DIR); \
+		$(SCONS_VARS) \
+		scons \
+			prefix=/usr \
+			$(SCONS_OPTIONS) \
+		install \
+	)
+endef
+
+define Build/Compile
+endef