I/O redirect issue in Makefile

[Thomas Glanzman]

Phosim 3.4.2, Makefile line 13

csh -c "if (-d .git) git log -1 --format=commit' '%H >> bin/version"

fails if bin/version does not already exist. I changed ">>" to ">" to make progress, but something like ">>!" would also work.

[John Peterson]

fixed in v3.5