Reverse dependencies for libmspack

Latest version of the following gems require libmspack

Gem	Version	Date	Downloads
exchange-offline-address-book +33.4 Thousand Downloads	`0.0.23` June 30, 2017	June 30, 2017	33.4 Thousand
LP-Exporter +10.9 Thousand Downloads	`0.1.0` August 08, 2017	August 08, 2017	10.9 Thousand
XLiveServices +9.53 Thousand Downloads	`0.1.0` May 29, 2016	May 29, 2016	9.53 Thousand