Replace a ton of trivial #ifdefs with runtime checks

This one is big, but unless I missed something, should be all be
trivial.

scripted-diff with the following, then manually tweaked whatever needed:
```

if [ $# -ne 3 ]; then
    echo "Usage: $0 '<pattern>' '<replacement>' '<filename>'"
    exit 1
fi

pattern="$1"
replacement="$2"
filename="$3"

if [ ! -f "$filename" ]; then
    echo "Error: File $filename does not exist."
    exit 1
fi

sed -i '/'"$pattern"'/ {
    :loop
    $ !{
        N
        /'"$pattern"'.*\n.*#endif/ {
            s/'"$pattern"'/'"$replacement"'/
            s/#else/} else {/
            s/#endif/}/
            P
            D
        }
        /'"$pattern"'/ b loop
    }
}' "$filename"

echo "Replacement complete in $filename"
```

h/t to Grok2 for the sed command

Ja2/SaveLoadGame.cpp

@@ -152,6 +152,7 @@
 #endif
 
 #include "LuaInitNPCs.h"
+#include <language.hpp>
 
 
 #ifdef JA2UB
@@ -7205,7 +7206,7 @@ BOOLEAN LoadSoldierStructure( HWFILE hFile )
 					}
 				}
 
-#ifdef GERMAN
+if( g_lang == i18n::Lang::de ) {
 				// Fix neutral flags
 				if ( guiCurrentSaveGameVersion < 94 )
 				{
@@ -7215,7 +7216,7 @@ BOOLEAN LoadSoldierStructure( HWFILE hFile )
 						Menptr[ cnt].aiData.bNeutral = FALSE;
 					}
 				}
-#endif
+}
 				//#ifdef JA2UB
 				//if the soldier has the NON weapon version of the merc knofe or merc umbrella
 				//ConvertWeapons( &Menptr[ cnt ] );
@@ -9896,9 +9897,9 @@ UINT32 CalcJA2EncryptionSet( SAVED_GAME_HEADER * pSaveGameHeader )
 		}
 	}
 
-	#ifdef GERMAN
+	if( g_lang == i18n::Lang::de ) {
 		uiEncryptionSet *= 11;
-	#endif
+	}
 
 	uiEncryptionSet = uiEncryptionSet % 10;