[Rpm-maint] [rpm-software-management/rpm] configure.ac: reference zlib when checking libmagic (#118)

[jdknight-rockwellcollins]

When attempting to check for `magic_open` in libmagic (aka file),
linking can fail as libmagic and zlib may have been statically built:

    configure:20636: .../arm-linux-gcc -std=gnu99 -o conftest ... conftest.c -lmagic  -lpthread  >&5
    conftest.c:42:1: warning: function declaration isn't a prototype [-Wstrict-prototypes]
    ...
    .../sysroot/usr/lib/libmagic.a(compress.o): In function `uncompresszlib':
    compress.c:(.text+0x190): undefined reference to `inflateInit_'
    compress.c:(.text+0x1a8): undefined reference to `inflateInit2_'
    compress.c:(.text+0x1bc): undefined reference to `inflate'
    compress.c:(.text+0x1d4): undefined reference to `inflateEnd'
    compress.c:(.text+0x1fc): undefined reference to `zError'
    collect2: error: ld returned 1 exit status
    ...
    configure:20645: result: no
    configure:20654: error: missing required library 'libmagic'

The following adds the rpm-dependent zlib library to ensure the check
for `magic_open` can find the dependent decompression methods.

Signed-off-by: James Knight <james.knight at rockwellcollins.com>
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/118

-- Commit Summary --

  * configure.ac: reference zlib when checking libmagic

-- File Changes --

    M configure.ac (2)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/118.patch
https://github.com/rpm-software-management/rpm/pull/118.diff

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