[NQP Bump] Brings 15 commits
[NQP Bump] Brings 15 commits

NQP bump brought: https://github.com/perl6/nqp/compare/2019.07.1-53-g39223e731...2019.07.1-68-g8fb861b16
8fb861b16 [MoarVM Bump] Brings 2 commits
a83caea48 Merge pull request #558 from Kaiepi/portable-socket-families
50e249647 Fix documented minimum JDK to JDK9
2add6edf3 bump moar revision for some stability fixes
8a656309c output "stage parse" later (for nested output), also flush stderr every line
2b886d62d Merge pull request #570 from cygx/fix-mingw
b969c3cc5 set -municode in LD_M_BUILD_RUNNER to fix the MinGW build
d1e31ed90 [js] Implement nqp::intify
50d750eea [js] Unbitrot the build system
16e146764 qast mention
de27fc568 Mention extops. Fix typos and formating.
ef47a4b3d fix formatting of ops.markdown
df7fa7bec start documenting serialization opcodes
c90e0304c Use nqp::const for socket family constants
da80b36e2 Make socket family handling portable

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