[Bug 773423] cerbero: Build fixes for taglib on macOS Sierra and Xcode 8

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773423

--- Comment #1 from Arun Raghavan <arun at arunraghavan.net> ---
Created attachment 338351
  --> https://bugzilla.gnome.org/attachment.cgi?id=338351&action=edit
osx: Fix CMake build when CFLAGS doesn't have -isysroot

We now look for -isysroot in CFLAGS, CXXFLAGS and CPPFLAGS (which did
have it in this case). The build was otherwise broken for taglib with
macOS Sierra and Xcode 8.

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