Merge topic 'update-expat'

58216d16 expat: Suppress compiler warnings
f177c8a0 expat: Re-write CMake build system for our needs
4544c68a expat: Hard-code configuration options for our needs
9f7de396 expat: Drop upstream test/install/packaging code
b4678e1c expat: Update cm_expat.h wrapper for new header location
94c62680 Merge branch 'upstream-expat' into update-expat
318b1c17 expat 2016-05-01 (379213ca)
48764630 expat: Disable all whitespace checks in third-party code
f4bd9d43 Add script to update Expat from upstream
7eb7a189 Drop old expat sources to make room for a fresh import