NetBSD/src 7Zbo0Veshare/mk bsd.own.mk, tools/gcc Makefile gcc-version.mk

   obsolete gcc 5 support.
   add gcc 7 support.  call it "nb1 20190119"
VersionDeltaFile
1.88+5-8tools/gcc/Makefile
1.13+2-2tools/gcc/gcc-version.mk
1.1095+3-1share/mk/bsd.own.mk
+10-113 files

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