sys/lib/libz build fail with -Wshadow, conflict between local variable min/max and libkern.h's min/max func

[Takehiko NOZAKI]

T/O

[Takehiko NOZAKI]

libkern.h’s min/max conflict with libz and everywhere, but renaming is too huge works, see TNF’s HEAD change https://mail-index.netbsd.org/source-changes/2018/09/03/msg098810.html

[Takehiko NOZAKI]

BUGFIX: Issue #373 - sys/lib/libz build fail with -Wshadow, conflict between local variable min/max and libkern.h's min/max func

XXX this is temporary fix, add TODO rename libkern's min/max

→ <<cset 8e3f62659b51>>