[GLib] Fail to build with rpath-ed Arrow C++ on macOS

[asfimport]

http://mail-archives.apache.org/mod_mbox/arrow-dev/201808.mbox/%3C1533195722.2696142.1460869648.3991D444%40webmail.messagingengine.com%3E

I had the same problem with Glib in GISCAN as mentioned in #2303 (comment)
I replaced the make call with LD_LIBRARY_PATH=$ARROW_HOME/lib make but did not seem to fix
my problem.

Reporter: Kouhei Sutou / @kou
Assignee: Kouhei Sutou / @kou

PRs and other links:

• GitHub Pull Request #2374

_{Note: This issue was originally created as ARROW-2990. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 2374
#2374