SCUMM: Fix bug #3306145: INDY3: EGA version script bugs

Based on a patch presented in the bugreport. Fixes several bugs
connected with calcualting IQ points in Amiga versions of Indy3.

Author: sev-

engines/scumm/script_v4.cpp

@@ -68,6 +68,18 @@ void ScummEngine_v4::o4_ifState() {
 	int a = getVarOrDirectWord(PARAM_1);
 	int b = getVarOrDirectByte(PARAM_2);
 
+	// WORKAROUND bug #3306145 (also occurs in original): Some old versions of
+	// Indy3 sometimes fail to allocate IQ points correctly. To quote:
+	// "About the points error leaving Castle Brunwald: It seems to "reversed"!
+	// When you get caught, free yourself and escape, you get 25 IQ points even
+	// though you're not supposed to. However if you escape WITHOUT getting
+	// caught, you get 0 IQ points (supposed to get 25 IQ points)."
+	// This workaround is meant to address that.
+	if (_game.id == GID_INDY3 && a == 367 &&
+	    vm.slot[_currentScript].number == 363 && _currentRoom == 25) {
+		b = 0;
+	}
+
 	jumpRelative(getState(a) == b);
 }
 

engines/scumm/script_v5.cpp

@@ -2095,6 +2095,20 @@ void ScummEngine_v5::o5_startScript() {
 	if (_game.id == GID_ZAK && _game.platform == Common::kPlatformFMTowns && script == 171)
 		return;
 
+	// WORKAROUND bug #3306145 (also occurs in original): Some old versions of
+	// Indy3 sometimes fail to allocate IQ points correctly. To quote:
+	// "In the Amiga version you get the 15 points for puzzle 30 if you give the
+	// book or KO the guy. The PC version correctly gives 10 points for puzzle
+	// 29 for KO and 15 for puzzle 30 when giving the book."
+	// This workaround is meant to address that.
+	if (_game.id == GID_INDY3 && vm.slot[_currentScript].number == 106 && script == 125 && VAR(115) != 2) {
+		// If Var[115] != 2, then:
+		// Correct: startScript(125,[29,10]);
+		// Wrong : startScript(125,[30,15]);
+		data[0] = 29;
+		data[1] = 10;
+	}
+
 	// Method used by original games to skip copy protection scheme
 	if (!_copyProtection) {
 		// Copy protection was disabled in LucasArts Classic Adventures (PC Disk)