[9front] ape: remove _SUSV2_SOURCE guard from inttypes.h

inttypes.h was added to C99, and this is the only header that used
_SUSV2_SOURCE.

Also, remove now unneeded _SUSV2_SOURCE from python mkfile.

sys/include/ape/inttypes.h

@@ -1,7 +1,3 @@
-#ifndef _SUSV2_SOURCE
-#error "inttypes.h is SUSV2"
-#endif
-
 #ifndef _INTTYPES_H_
 #define _INTTYPES_H_ 1
 

sys/src/cmd/python/Extra/mkfile

@@ -7,7 +7,7 @@ OFILES=`{du -a . | grep '.c$'  | awk '{print $2}' | sed 's/.$/\$O/'}
 
 </sys/src/cmd/mklib
 
-CFLAGS=-c -I.. -I../Include -DT$objtype -D_SUSV2_SOURCE -DNDEBUG
+CFLAGS=-c -I.. -I../Include -DT$objtype -DNDEBUG
 
 %.$O: %.c
 	$CC $CFLAGS -o $stem.$O $stem.c