* Update make_libsecp256k1.sh
Avoid error when parent folder has spaces `./make_libsecp256k1.sh: line 31: cd: too many arguments`
* Avoid error when parent folder has spaces, fix for make_libsecp256k1.sh, make_zbar.sh and make_libusb.sh
Co-authored-by: ghost43 <somber.night@protonmail.com>
If there is a collision between a branch name and a commit hash, git
will choose the branch, even if the full 40-hex-long commit hash is
given. GitHub disallows branches/tags with such a name but git itself
does not. By adding the `^{commit}` syntax sugar after a ref name,
we can tell git that we want the commit hash to be preferred,
and hence we don't need to trust GitHub (only git).
see https://security.stackexchange.com/questions/225411/