Remove INT_MIN that came from the AST merge.
INT_MIN is used in Python/compile.c, but it was also used
in Objects/abstract.c Python/getargs.c.  If we need it for compile.c,
we can get it from the same place as the other files.
diff --git a/Include/pyport.h b/Include/pyport.h
index ea2091b..2440c55 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -583,7 +583,6 @@
 
 #ifndef INT_MAX
 #define INT_MAX 2147483647
-#define INT_MIN (-INT_MAX - 1)
 #endif
 
 #ifndef LONG_MAX