bpftools: update to v5.11.16, simplify make

Update to the latest stable upstream version.

Drop unneeded make variables to remove redundant assignments seen during
invocation of package Makefile.

Also remove the following patch now included upstream:

  * 200-fix-install-param-order-on-macos.patch

Compile and run-tested on malta/mips32be, using bpftool directly and also
libbpf (linked with tc) to inspect and load simple eBPF programs.

Signed-off-by: Tony Ambardar <itugrok@yahoo.com>

package/network/utils/bpftools/Makefile

@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=bpftools
-PKG_VERSION:=5.11.2
-PKG_RELEASE:=2
+PKG_VERSION:=5.11.16
+PKG_RELEASE:=1
 
 PKG_SOURCE:=linux-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@KERNEL/linux/kernel/v5.x
-PKG_HASH:=904a5b3cbaf5264ef8da6c7a5445fa7ea19168ad77fb83a7cc1b8ba95d52d0a0
+PKG_HASH:=21163681d130cbce5a6be39019e2c69e44f284855ddd70b1a3bd039249540f43
 
 PKG_MAINTAINER:=Tony Ambardar <itugrok@yahoo.com>
 
@@ -93,9 +93,11 @@ ifneq ($(BUILD_VARIANT),lib)
   TARGET_LDFLAGS += -Wl,--gc-sections
 endif
 
-MAKE_FLAGS += \
+MAKE_VARS = \
 	EXTRA_CFLAGS="$(TARGET_CFLAGS) $(TARGET_CPPFLAGS)" \
-	LDFLAGS="$(TARGET_LDFLAGS)" \
+	LDFLAGS="$(TARGET_LDFLAGS)"
+
+MAKE_FLAGS += \
 	BPFTOOL_VERSION="$(LINUX_VERSION)" \
 	FEATURES_DUMP="$(PKG_BUILD_DIR)/FEATURE-DUMP.openwrt" \
 	OUTPUT="$(PKG_BUILD_DIR)/" \