gemhome/rmagick — pull request #156 by bf4 (2014-12-04 04:11:31+00:00)
Title: Fix #148; More robust feature detection

PR #125 added the string Magick::Magick_features

Issue #148 reported compilation failures on
```plain
Mac OSX Yosemite
Rails 4.2.0.beta4
rake, version 10.4.0
ImageMagick 6.8.9-8 Q16 x86_64 (via macports)

in rmmain.c:1724:28:
error: use of undeclared identifier 'MagickSupport'

This PR now makes the flow to use if defined:
GetMagickFeatures() or
MagickFeatures or
MagickSupport or
"unknown"
```