Add bnot for int types

[primo-ppcg]

Fixes #1208

[sogaiu]

Thanks!

[primo-ppcg]

@bakpakin a copy-paste mistake, if you could patch this:

diff --git a/src/core/inttypes.c b/src/core/inttypes.c
@@ -580,7 +580,7 @@
 DIVMETHODINVERT(uint64_t, u64, mod, %)
 OPMETHOD(uint64_t, u64, and, &)
 OPMETHOD(uint64_t, u64, or, |)
 OPMETHOD(uint64_t, u64, xor, ^)
-UNARYMETHOD(int64_t, u64, not, ~)
+UNARYMETHOD(uint64_t, u64, not, ~)
 OPMETHOD(uint64_t, u64, lshift, <<)
 OPMETHOD(uint64_t, u64, rshift, >>)