add clang32 to more packages.

All packages which successfully built on clang64, for which all of their
dependencies are already available for clang32.

Batch 2

mingw-w64-python-singledispatch/PKGBUILD

@@ -8,7 +8,7 @@ pkgver=3.6.2
 pkgrel=1
 pkgdesc='Backport functools.singledispatch from Python 3.4 to Python 2.6-3.3. (mingw-w64)'
 arch=('any')
-mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64')
+mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clang32')
 url="https://pypi.org/project/singledispatch/"
 license=('MIT')
 depends=(