Canonicalize the path used by sh.

With a bunch of LibC work to support the feature. LibC now initializes
AK::StringImpl by default. It's now fine to use AK in LibC/Userland! :^)

LibC/assert.h

@@ -0,0 +1,14 @@
+#pragma once
+
+extern "C" {
+
+void __assertion_failed(const char* msg, const char* file, unsigned line, const char* func);
+
+#define assert(expr) (static_cast<bool>(expr) ? (void)0 : __assertion_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__))
+#define CRASH() do { asm volatile("ud2"); } while(0)
+#define ASSERT assert
+#define RELEASE_ASSERT assert
+#define ASSERT_NOT_REACHED() assert(false)
+
+}
+