[cmake] Update SOVERSION for the new versioning scheme

[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: https://llvm.org/svn/llvm-project/llvm/trunk@292255 91177308-0d34-0410-b5e6-96231b3b80d8