rtpengine is not primarily about kernel modules. It's an application
(which also offers a kernel module). So build it in BUILD_DIR instead of
KERNEL_BUILD_DIR.
Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>
PKG_SOURCE_URL:=https://codeload.github.com/sipwise/rtpengine/tar.gz/mr$(PKG_VERSION)?
PKG_HASH:=754711a46fc50001b2e840521d3b6fd654cb2f9da11924ca40d8e165fba6bd98
-PKG_BUILD_DIR:=$(KERNEL_BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_NAME)-mr$(PKG_VERSION)
+PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_NAME)-mr$(PKG_VERSION)
PKG_LICENSE:=GPL-3.0
PKG_LICENSE_FILES:=LICENSE