kamailio: refactor to use PKG_BUILD_FLAGS:=no-mips16

See commit 5c545bdb "treewide: replace PKG_USE_MIPS16:=0 with
PKG_BUILD_FLAGS:=no-mips16" on the main repository.
Signed-off-by: NAndre Heider <a.heider@gmail.com>

net/kamailio/Makefile

@@ -15,7 +15,7 @@ PKG_RELEASE:=$(AUTORELEASE)
 PKG_SOURCE_URL:=https://www.kamailio.org/pub/kamailio/$(PKG_VERSION)/src
 PKG_SOURCE:=kamailio-$(PKG_VERSION)_src.tar.gz
 PKG_HASH:=ea3cd5d688c34208b92072c3844c8276b693e0ca2c688168ea0357978c76b32d
-PKG_USE_MIPS16:=0
+PKG_BUILD_FLAGS:=no-mips16
 
 PKG_LICENSE:=GPL-2.0+
 PKG_LICENSE_FILES:=COPYING