This script is very interesting because actually it's impossible to install -dev packages for amd64/i386 in same time.
These are the steps that i did to build Wine :
1- "apt-get build-dep wine" to install amd64 dev packages
2- "aptitude install ia32-libs" to install the lib depends i386 for wine / #Install Wine:i386 must to be suffisant ?
3- Installation manually for others i386 packages like "libncurse5:i386"
To resume, the script must be launch in the Wine source folder and it create symlink between "/usr/lib/i386-linux-gnu" and the Wine source folder. I added 3 others symlink because the lib are present in "/lib/i386-linux-gnu"
I tried the script in a 64bits chroot and i build Wine64 without problem, except the WARNING concerning libldap, libpng and libjpeg when i compile Wine32Bits but i have not problem when i use my 64Bits wineprefix/32Bits wineprefix.