Workaround for quoting problems in amudprun
Workaround for quoting problems in amudprun

If an environment variable contained ` then spawning using amudprun over SSH
would run extra commands.

Ideally, this should be fixed in GASNet's function AMUDP_SPMDSshSpawn in
/other/amudp/amudp_spawn.cpp, but for now, I've just added a workaround for
a bad case I encountered.

CoryMcCartan/chapel,chizarlicious/chapel,CoryMcCartan/chapel,hildeth/chapel,chizarlicious/chapel,hildeth/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,hildeth/chapel,chizarlicious/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,hildeth/chapel,hildeth/chapel,hildeth/chapel,chizarlicious/chapel,chizarlicious/chapel,chizarlicious/chapel,chizarlicious/chapel,CoryMcCartan/chapel,hildeth/chapel