Kernel: Properly define IOV_MAX

Author: https://github.com/timschumi
Commit: 098af0f846
Pull-request: https://github.com/SerenityOS/serenity/pull/13886
Reviewed-by: https://github.com/petelliott ✅

Kernel/API/POSIX/sys/uio.h

@@ -12,6 +12,9 @@
 extern "C" {
 #endif
 
+// Arbitrary pain threshold.
+#define IOV_MAX 1024
+
 struct iovec {
     void* iov_base;
     size_t iov_len;