DynamicLoader: Add missing strlen definition

userspace/programs/DynamicLoader/utils.cpp

@@ -28,6 +28,14 @@ static const char* errno_to_string(int error);
 	__builtin_unreachable();
 }
 
+size_t strlen(const char* s)
+{
+	size_t len = 0;
+	while (*s++)
+		len++;
+	return len;
+}
+
 int strcmp(const char* s1, const char* s2)
 {
 	const unsigned char* u1 = reinterpret_cast<const unsigned char*>(s1);

userspace/programs/DynamicLoader/utils.h

@@ -40,6 +40,8 @@ inline void print_uint(int fd, T val, uint8_t base = 10)
 	print(fd, ptr);
 }
 
+size_t strlen(const char* s);
+
 int strcmp(const char* s1, const char* s2);
 char* strcpy(char* __restrict s1, const char* __restrict s2);