PR https://github.com/google/googletest/pull/3940 added COMPILE_PDB_OUTPUT_DIRECTORY
without updating the install command to accommodate the two PDB properties.
COMPILE_PDB_* and PDB_* properties are two distinct properties that affect static
(COMPILE_PDB_*) and shared (PDB_*) separately.
This commit adds cmake install rule for both types (optionally) to install when available
