* 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>