LibC/Kernel: Implement access

userspace/libraries/LibC/include/sys/syscall.h

@@ -83,6 +83,7 @@ __BEGIN_DECLS
 	O(SYS_SETSOCKOPT,		setsockopt)		\
 	O(SYS_REALPATH,			realpath)		\
 	O(SYS_TTYNAME,			ttyname)		\
+	O(SYS_ACCESS,			access)			\
 
 enum Syscall
 {

userspace/libraries/LibC/unistd.cpp

@@ -496,3 +496,8 @@ char* ttyname(int fildes)
 		return nullptr;
 	return storage;
 }
+
+int access(const char* path, int amode)
+{
+	return syscall(SYS_ACCESS, path, amode);
+}