patch 8.2.1173: tee doesn't build on some systems

Problem: Tee doesn't build on some systems.
Solution: Include header files. (Dominique Pelle, closes #6431)

patch 8.2.1172: error messages when doing "make clean" in doc or tee

Problem: Error messages when doing "make clean" in the runtime/doc or
src/tee directories.
Solution: Use "rm -f".

patch 8.1.0500: cleaning up in src/tee may not always work

Problem: Cleaning up in src/tee may not always work.
Solution: Use "rm" when appropriate. (Michael Soyka, closes #3571)

patch 8.1.0483: MinGW does not build tee.exe

Problem: MinGW does not build tee.exe.
Solution: Add build instructions. (Yasuhiro Matsumoto, closes #3548)

patch 8.0.1178: using old compiler on MS-Windows

Problem: Using old compiler on MS-Windows.
Solution: Switch default build on MS-Windows to use MSVC 2015. (Ken Takata)