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

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Insist that ssize_t is defined.

diff --git a/util/cairo-missing/cairo-missing.h b/util/cairo-missing/cairo-missing.h
index 7e4f0a3..c20b869 100644
--- a/util/cairo-missing/cairo-missing.h
+++ b/util/cairo-missing/cairo-missing.h
@@ -37,6 +37,8 @@
 #include <string.h>
 #include <sys/types.h>
 
+#define _SSIZE_T_DEFINED 1
+
 #ifdef _WIN32
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>