Revert "Reset pc_compat before second pass"

This reverts commit 3c22187fb494592a51162c3863b3521cf1d74cc3.

That commit broke the -Z compile flag. The idea was to allow having
different compat modes for regions of code.

source/compiler/sc1.c

@@ -844,7 +844,6 @@ static void resetglobals(void)
   sc_curstates=0;
   pc_memflags=0;
   pc_naked=FALSE;
-  pc_compat=FALSE;
 }
 
 static void initglobals(void)