Create macro for defining and empty/dummy __psp_libc_init function

src/user/pspmoduleinfo.h

@@ -144,4 +144,8 @@ enum PspModuleInfoAttr
 /* Declare the name of the main thread */
 #define PSP_MAIN_THREAD_NAME(s) const char* sce_newlib_main_thread_name = (s)
 
+/* Disable the use of newlib, getting a minimal binary. */
+#define PSP_DISABLE_NEWLIB() \
+	void __psp_libc_init(int argc, char *argv[]) {}
+
 #endif /* PSPMODULEINFO_H */