Since commit v2.8.12~437^2~2 (VS: Separate compiler and linker PDB files
2013-04-05) we no longer set /Fd with the PDB_NAME or PDB_OUTPUT_DIRECTORY
properties. Those properties now exclusively handle linker PDB files.
Since STATIC libraries do not link their compiler PDB file becomes more
important. Add new target properties "COMPILE_PDB_NAME[_<CONFIG>]" and
"COMPILE_PDB_OUTPUT_DIRECTORY[_<CONFIG>]" to specify the compiler PDB
file location and pass the value to the MSVC /Fd option.
Move the note about VS 6 into the PDB_NOTE.txt common include file
and include it from the per-config properties too. Also re-word
the note to clarify the separate compiler and linker flags involved
and state explicitly that compiler flags are not affected.
Document PDB_NAME and PDB_OUTPUT_DIRECTORY as applying only to shared
libraries and executables. Add an explicit note to explain why they
do not work for static libraries.
