OpenBSD/ports OL2Fx9Gnet/bitcoin Makefile distinfo, net/bitcoin/patches patch-configure_ac

   Update bitcion to 0.18.1

   Release notes:
   https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.18.1.md
VersionDeltaFile
1.19+2-3net/bitcoin/Makefile
1.8+2-2net/bitcoin/distinfo
1.3+2-2net/bitcoin/patches/patch-configure_ac
1.5+2-1net/bitcoin/pkg/PLIST
+8-84 files

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