perl.h: Add some missing pTHX_n (n is a number)

This makes sure these macros exist for every current usage.

Author: khwilliamson

perl.h

@@ -238,6 +238,8 @@ Now a synonym for C<L</dTHXa>>.
 #  define pTHX_7	8
 #  define pTHX_8	9
 #  define pTHX_9	10
+#  define pTHX_10	11
+#  define pTHX_11	12
 #  define pTHX_12	13
 #  if defined(DEBUGGING) && !defined(PERL_TRACK_MEMPOOL)
 #    define PERL_TRACK_MEMPOOL
@@ -732,6 +734,8 @@ code.
 #  define pTHX_7	7
 #  define pTHX_8	8
 #  define pTHX_9	9
+#  define pTHX_10	10
+#  define pTHX_11	11
 #  define pTHX_12	12
 #endif