ARROW-5064: [Release] Pass PKG_CONFIG_PATH to glib in the verification script
ARROW-5064: [Release] Pass PKG_CONFIG_PATH to glib in the verification script

Author: Krisztián Szűcs <szucs.krisztian@gmail.com>

Closes #4073 from kszucs/osx-glib-pkg-config and squashes the following commits:

9b0f4c5b <Krisztián Szűcs> check for brew in the condition
851a8d56 <Krisztián Szűcs> pass pkg config path

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