[cmake] Change deprecated $<CONFIG> to $<CONFIGURATION>. NFC
[cmake] Change deprecated $<CONFIG> to $<CONFIGURATION>. NFC

See rL357338 for a similar change. The informational expression
$<CONFIGURATION> has been deprecated since CMake 3.0

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@357348 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt