Our Linux release machine 'magrathea' has a very old Linux to help build
portable binaries. It is so old that <elf.h> does not define the
DT_RUNPATH constant. Define the correct value in the build flags to
activate handling of ELF RUNPATH entries in the binary release.
Set GIT_COMMAND to "git" -- each machine involved in building
the CMake release binaries has the right "git" in the PATH.
Separate the release scripts into two batches so we can build
multiple releases on the same machine, in serial, if necessary.
We currnetly do this with the Windows and Cygwin release
binaries on dash2win64.
Sort the files to be uploaded, so that sorting them by modification
time (file copy / upload time) is equivalent to sorting them
alphabetically.
