Add patch for curl missing sys/select.h

recipes/curl/03-redox-sys-select.patch

+--- source/include/curl/curl.h	2017-08-07 15:42:29.000000000 -0700
++++ build/include/curl/curl.h	2018-09-20 14:27:20.462414020 -0700
+@@ -74,6 +74,7 @@
+ #if defined(_AIX) || defined(__NOVELL_LIBC__) || defined(__NetBSD__) || \
+     defined(__minix) || defined(__SYMBIAN32__) || defined(__INTEGRITY) || \
+     defined(ANDROID) || defined(__ANDROID__) || defined(__OpenBSD__) || \
++    defined(__redox__) || \
+    (defined(__FreeBSD_version) && (__FreeBSD_version < 800000))
+ #include <sys/select.h>
+ #endif