DynamicLoader: Add missing strlen definition

This prevented building the toolchain

userspace/libraries/LibC/CMakeLists.txt

@@ -43,6 +43,7 @@ set(LIBC_SOURCES
 	strings.cpp
 	sys/banan-os.cpp
 	sys/epoll.cpp
+	sys/eventfd.cpp
 	sys/file.cpp
 	sys/futex.cpp
 	sys/ioctl.cpp
@@ -99,8 +100,8 @@ banan_install_headers(objlibc)
 add_library(libc-static STATIC $<TARGET_OBJECTS:objlibc>)
 add_library(libc-shared SHARED $<TARGET_OBJECTS:objlibc>)
 
-target_link_options(libc-static PRIVATE -nolibc)
+target_link_options(libc-static PRIVATE -nolibc -nostdlib++)
-target_link_options(libc-shared PRIVATE -nolibc)
+target_link_options(libc-shared PRIVATE -nolibc -nostdlib++)
 
 install(TARGETS libc-static OPTIONAL)
 install(TARGETS libc-shared OPTIONAL)

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);