Fix compilation error when building OpenSSL 1.1.1q in MacOS 11+ for 3.9.16 (#2558)

plugins/python-build/share/python-build/patches/3.9.16/openssl-1.1.1q/openssl_1.1.1q_fix_c_include.patch

@@ -0,0 +1,12 @@
+diff --git a/test/v3ext.c b/test/v3ext.c
+index 7a240cd706..6cec6f1a9b 100644
+--- a/test/v3ext.c
++++ b/test/v3ext.c
+@@ -15,6 +15,7 @@
+ #include <openssl/err.h>
+ #include "internal/nelem.h"
+ 
++#include <string.h>
+ #include "testutil.h"
+ 
+ static const char *infile;