[MoarVM Bump] Brings 7 commits

MoarVM bump brought: MoarVM/MoarVM@2018.03-19-ga5ed7ea...2018.03-26-gb1f64db
b1f64db Add missing include for Grisu3 dtoa function
67e5093 only suspend on actually must-suspend breakpoints
d322741 Merge pull request #820 from samcv/shiftjis
edfde24 Use windows-932 instead of shiftjis for enc name
62cfb2f Make sure to throw in shiftjis decode if byte after lead
d44d7d1 Ensure a failed JIS result is distinct from 0
e8fdb35 Add shiftjis decode and decodestream support

tools/build/MOAR_REVISION

@@ -1 +1 @@
-2018.03-19-ga5ed7ea
+2018.03-26-gb1f64db