patch 9.1.2022: using C++ keyword class as member variable name

Problem:  A recent commit introduced a member variable named `class` in
          the `exarg` structure, which conflicts with the C++ keyword
          `class`. This causes compilation issues on Windows when VIM
          is compiled with OLE enabled, as "if_ole.cpp" cannot compile
          due to the keyword conflict (after v9.1.2012).
Solution: Rename the member variable of `exarg` from `class` to `ea_class`.
          (Wei Tang)

related: #18949
closes:  #19016

Signed-off-by: Wei Tang <gauchyler@uestc.edu.cn>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: Wei Tang

src/eval.c

@@ -131,7 +131,7 @@ fill_evalarg_from_eap(evalarg_T *evalarg, exarg_T *eap, int skip)
 	evalarg->eval_getline = eap->ea_getline;
 	evalarg->eval_cookie = eap->cookie;
     }
-    evalarg->eval_class = eap->class;
+    evalarg->eval_class = eap->ea_class;
 }
 
 /*

src/ex_cmds.h

@@ -1973,7 +1973,7 @@ struct exarg
     void	*cookie;	// argument for getline()
 #ifdef FEAT_EVAL
     cstack_T	*cstack;	// condition stack for ":if" etc.
-    class_T	*class;		// Name of class being defined. Used by :class
+    class_T	*ea_class;		// Name of class being defined. Used by :class
 				// and :enum commands.
 #endif
 };

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2022,
 /**/
     2021,
 /**/

src/vim9class.c

@@ -2122,7 +2122,7 @@ ex_class(exarg_T *eap)
     cl->class_object_type.tt_type = VAR_OBJECT;
     cl->class_object_type.tt_class = cl;
 
-    eap->class = cl;
+    eap->ea_class = cl;
 
     // Add the class to the script-local variables.
     // TODO: handle other context, e.g. in a function