#2 Fix getcwd() non-portability

[Anonymous]

getcwd(NULL, 0) isn't portable, and resulted in some strange -C bugs on Solaris.
This switches it over to a fixed buffer of size MAXPATHLEN.

It also does some error checking.

This patch is also, hopefully, going into GCC's version of fastjar.

[Nobody/Anonymous]

Patch for getcwd() portability