Memory corruption with g_spawn_async_with_pipes

Version 0.9.2-2+b1 (Debian package), reproduces on Lua 5.1, 5.2 and 5.3. Host architecture is i686.

Sample code:

local GLib = require('lgi').GLib
local N = 1000000

local envp = {}
for i = 1, N do
	envp[#envp + 1] = ('VAR%u=%u'):format(i, i)
end

GLib.spawn_async_with_pipes('.', { '/bin/true' }, envp, { }, nil)

Depending on the value of N and the Lua version, this may corrupt the heap and fail an assertion on subsequent realloc or crash immediately.

Reproduce the sample with Lua 5.1, 5.2, and 5.3 on the reported i686 environment, varying N and observing heap corruption around GLib.spawn_async_with_pipes. Trace the binding entry point for that call and its handling of the envp table; done means the sample no longer corrupts memory or crashes during subsequent allocation.