Merging r292255: ------------------------------------------------------------------------ r292255 | mgorny | 2017-01-17 13:04:19 -0800 (Tue, 17 Jan 2017) | 12 lines
Merging r292255:
------------------------------------------------------------------------
r292255 | mgorny | 2017-01-17 13:04:19 -0800 (Tue, 17 Jan 2017) | 12 lines

[cmake] Update SOVERSION for the new versioning scheme

Update SOVERSION to use just the major version number rather than
major+minor, to match the new versioning scheme where only major is used
to indicate API/ABI version.

Since two-digit SOVERSIONs were introduced post 3.9 branching, this
change does not risk any SOVERSION collisions. In the past,
two-component X.Y SOVERSIONs were shortly used but those will not
interfere with the new ones since the new versions start at 4.

Differential Revision: https://reviews.llvm.org/D28730
------------------------------------------------------------------------


git-svn-id: 27e84c199cfb3049f109a3001c965f4b97b0bded@292270 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm