Create common github call define and start using it * Makefile.in: add GITHUB_PKG_UPDATE * src/blas_switch.mk, src/double-conversion.mk, src/libffi.mk, src/libgeotiff.mk, src/libmodbus.mk, src/libproxy.mk, src/librsvg.mk, src/libsndfile.mk, src/libsodium.mk, src/libvpx.mk, src/netcdf.mk, src/of-statistics.mk, src/openblas.mk, src/opencv.mk, src/openjpeg.mk, src/openlibm.mk, src/paho-mqtt-c.mk, src/pcre2.mk, src/portaudio.mk, src/rapidjson.mk, src/rtmidi.mk, src/suitesparse.mk, src/sundials-ida.mk, src/wt.mk, src/wxwidgets.mk, src/yasm.mk, src/zeromq.mk : call GITHUB_PKG_UPDATE in update

--- a/src/opencv.mk	Mon Nov 07 09:51:40 2022 -0500
+++ b/src/opencv.mk	Tue Nov 08 09:37:16 2022 -0500
@@ -11,9 +11,7 @@
                    openblas openexr tiff xz zlib
 
 define $(PKG)_UPDATE
-    $(WGET) -q -O- 'https://github.com/opencv/opencv/tags' | \
-    $(SED) -n 's|.*releases/tag/\([^"]*\).*|\1|p' | $(SORT) -V | \
-    tail -1
+    $(call GITHUB_PKG_UPDATE,opencv,opencv,)
 endef
 
 # -DCMAKE_CXX_STANDARD=98 required for non-posix gcc7 build