Disable vector (orc causes random segfaults)

vips.go

@@ -59,6 +59,10 @@ func initVips() {
 
 	C.vips_concurrency_set(1)
 
+	// Vector calculations cause SIGSEGV sometimes when working with JPEG.
+	// It's better to disable it since profit it quite small
+	C.vips_vector_set_enabled(0)
+
 	if len(os.Getenv("IMGPROXY_VIPS_LEAK_CHECK")) > 0 {
 		C.vips_leak_set(C.gboolean(1))
 	}

vips.h

@@ -2,6 +2,7 @@
 
 #include <vips/vips.h>
 #include <vips/vips7compat.h>
+#include <vips/vector.h>
 
 enum ImgproxyImageTypes {
   UNKNOWN = 0,