Tests: Build automatically, fix compilation errors

Author: https://github.com/BenWiederhake
Commit: 29eceebdbf
Pull-request: https://github.com/SerenityOS/serenity/pull/2947

Tests/Kernel/uaf-close-while-blocked-in-read.cpp

@@ -1,30 +0,0 @@
-#include <pthread.h>
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-
-int pipefds[2];
-
-int main(int, char**)
-{
-    pipe(pipefds);
-
-    pthread_t tid;
-    pthread_create(
-        &tid, nullptr, [](void*) -> void* {
-            sleep(1);
-            printf("Second thread closing pipes!\n");
-            close(pipefds[0]);
-            close(pipefds[1]);
-            pthread_exit(nullptr);
-            return nullptr;
-        },
-        nullptr);
-
-    printf("First thread doing a blocking read from pipe...\n");
-    char buffer[16];
-    int nread = read(pipefds[0], buffer, sizeof(buffer));
-    printf("Ok, read %d bytes from pipe\n", nread);
-
-    return 0;
-}