Makefile: Don't use --strip option to install(1) on Mac OS X
Makefile: Don't use --strip option to install(1) on Mac OS X

Apparently the install(1) that ships with Mac OS X doesn't support
the --strip option at all and when using the shorter form (-s) the
program terminates with an error:

    $ install -m 0755 -s logstash-filter-verifier /usr/local/bin/logstash-filter-verifier
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip:
    symbols referenced by indirect symbol table entries that can't be stripped in: /usr/local/bin/logstash-filter-verifier
    _malloc
    ___error
    _getnameinfo
    _getaddrinfo
    _free
    ...
    ___stderrp
    install: child process failed: xcrun strip - /usr/local/bin/logstash-filter-verifier

It's no big deal if we don't strip the installed binary so just
disable the stripping on Mac OS X. Fixes #53.

magnusbaeck/logstash-filter-verifier