libcc1 has a memory leak when calling fork_exec -- it allocates a new
vector of arguments, but then does not free it anywhere. This patch
changes this code to use std::vector instead.
Note that the previous code tried to avoid bad_alloc. I don't believe
this is very important. For one thing, plenty of other allocations do
not bother with this.
libcc1
* gdbctx.hh (do_compile): Use std::vector.
ee75ca6b72