Fixes for C23 compatibility.

--- reportlab-3.5.68/src/rl_addons/renderPM/gt1/gt1-parset1.c	2020-11-19 18:34:30.000000000 +0000
+++ reportlab-3.5.68/src/rl_addons/renderPM/gt1/gt1-parset1.c	2025-07-05 14:49:23.677558435 +0100
@@ -1608,15 +1608,15 @@
 internal_ifelse (Gt1PSContext *psc)
 {
 	Gt1Proc *proc1, *proc2;
-	int bool;
+	int bool_val;
 
 	if (psc->n_values >= 3 &&
-			get_stack_bool (psc, &bool, 3) &&
+			get_stack_bool (psc, &bool_val, 3) &&
 			get_stack_proc (psc, &proc1, 2) &&
 			get_stack_proc (psc, &proc2, 1))
 		{
 			psc->n_values -= 3;
-			if (bool)
+			if (bool_val)
 	eval_proc (psc, proc1);
 			else
 	eval_proc (psc, proc2);
@@ -1627,14 +1627,14 @@
 internal_if (Gt1PSContext *psc)
 {
 	Gt1Proc *proc;
-	int bool;
+	int bool_val;
 
 	if (psc->n_values >= 2 &&
-			get_stack_bool (psc, &bool, 2) &&
+			get_stack_bool (psc, &bool_val, 2) &&
 			get_stack_proc (psc, &proc, 1))
 		{
 			psc->n_values -= 2;
-			if (bool)
+			if (bool_val)
 	eval_proc (psc, proc);
 		}
 }
@@ -1669,12 +1669,12 @@
 static void
 internal_not (Gt1PSContext *psc)
 {
-	int bool;
+	int bool_val;
 
 	if (psc->n_values >= 1 &&
-			get_stack_bool (psc, &bool, 1))
+			get_stack_bool (psc, &bool_val, 1))
 		{
-			psc->value_stack[psc->n_values - 1].val.bool_val = !bool;
+			psc->value_stack[psc->n_values - 1].val.bool_val = !bool_val;
 		}
 }