refactor(sdk): add canonical headers for core libraries

core/libs/tests/GuestSystemServiceLoadExecStandardError.cpp

@@ -1,3 +1,4 @@
+#include "prx/libSceSystemService/include/SystemService.hpp"
 #include "prx/libc/include/general/VabiMacros.hpp"
 #include <cstdio>
 #include <cstdlib>
@@ -7,7 +8,7 @@
 #include <unistd.h>
 
 extern "C" {
-int APS5_VABI sceSystemServiceLoadExec(const char*, const char* const*);
+
 int APS5_VABI dup2_nid_postfix(int, int);
 }