[CMake] Fix a typo in the variable used to retrieve source file names for the `RTHwasan_dynamic` target.
[CMake] Fix a typo in the variable used to retrieve source file names
for the `RTHwasan_dynamic` target.

Differential Revision: https://reviews.llvm.org/D49178

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@336944 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