Revert r56044 (which changed the %c format specifier to accept a
unicode char into an int variable) and add %C which does this.
diff --git a/Python/modsupport.c b/Python/modsupport.c
index ba46409..330da5f 100644
--- a/Python/modsupport.c
+++ b/Python/modsupport.c
@@ -385,6 +385,12 @@
 
 		case 'c':
 		{
+			char p[1];
+			p[0] = (char)va_arg(*p_va, int);
+			return PyString_FromStringAndSize(p, 1);
+		}
+		case 'C':
+		{
 			int i = va_arg(*p_va, int);
 			Py_UNICODE c;
 			if (i < 0 || i > PyUnicode_GetMax()) {