SCI: Remove the unused and unnecessary VM hooks mechanism

This was introduced as an extra mechanism of patching game scripts.
However, it's completely hardcoded with offsets for specific game
versions, with no endianess handling. Furthermore, the only patch
it's used for at the moment (input prompt for SQ3) has no visible
changes.

The SCI engine's script patcher has pattern matching functionality,
which allows it to be used in a variety of game versions. Furthermore,
it supports endianess handling for BE versions. Thus, it makes no
sense to keep a separate and complex script patching functionality
for a single patch that is hardcoded for a single game version with
no actual change in functionality. Since this is a fan patch, all of
these script changes can be added as part of the patch without any
changes to the engine code. We've discussed this with @sluicebox and
decided to remove all of this code, which should not have been part
of the engine's codebase because it clashes with the existing script
patcher

engines/sci/engine/scriptdebug.cpp

@@ -39,8 +39,7 @@ namespace Sci {
 // This table is only used for debugging. Don't include it for devices
 // with not enough available memory (e.g. phones), where REDUCE_MEMORY_USAGE
 // is defined
-// Update: This is used in the VM hooks mechanism. TODO: Readd the memory check?
-//#ifndef REDUCE_MEMORY_USAGE
+#ifndef REDUCE_MEMORY_USAGE
 const char *opcodeNames[] = {
 	   "bnot",       "add",      "sub",      "mul",      "div",
 		"mod",       "shr",      "shl",      "xor",      "and",
@@ -69,7 +68,7 @@ const char *opcodeNames[] = {
 	   "-agi",      "-ali",     "-ati",     "-api",     "-sgi",
 	   "-sli",      "-sti",     "-spi"
 };
-//#endif	// REDUCE_MEMORY_USAGE
+#endif	// REDUCE_MEMORY_USAGE
 
 void DebugState::updateActiveBreakpointTypes() {
 	int type = 0;
@@ -150,9 +149,9 @@ reg_t disassemble(EngineState *s, reg_t pos, const Object *obj, bool printBWTag,
 		return retval;
 	}
 
-//#ifndef REDUCE_MEMORY_USAGE
+#ifndef REDUCE_MEMORY_USAGE
 	debugN("%-5s", opcodeNames[opcode]);
-//#endif
+#endif
 
 	static const char *defaultSeparator = "\t\t; ";