[FS#120] opkg fails with Out of memory on a device with 32 MB of RAM

[LEDE Bugs]

The following task has a new comment added:

FS#120 - opkg fails with Out of memory on a device with 32 MB of RAM
User who did this - Vittorio Gambaletta (VittGam)

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The fix seems to work, thanks! But I fail to understand why it's needed now. It didn't fail without vfork on CC with ~5 MB of free RAM, so why does it fail now on LEDE trunk with ~12 MB of free ram?...
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=120#comment323