A pointer to a string in a memory buffer was losing its value. The reason was that the buffer was occasionally being used for other purposes. The fix is to strdup() the string so that there is a private, protected copy.
tools/zds: A new tool sub-directory intended to hold tools for making life working with the ZDS-II toolchain less painful.
tools/zds/zdsar.c: This is a wrapper around the ZDS_II librarian. It simplifies the build scripts by replacing large sequences of complex Bash script that were added to the build files. Not only does this clean up the build files but it also improves performance and, more importantly, provides a common solution for the Windows native build case. This tool should work with all ZDS-II based platforms including z8, zNeo, and ez80.
tools/README.txt: Add a brief description about the zds sub-directory. Also re-ordered some tool descriptions. They are supposed to be in alphabetical order, but this seems to have fallen apart.
boards/z80/ez80/scripts/eZ80_Config.mk: Updated to use tools/zds/zdsar.exe.
