postgresql: split out some lib files into seperate packages

1. Split out libecpg-compat-dev, libecpg-staticdev, libecpg-doc, libpq-staticdev,
libpgtypes-staticdev and libpgtypes-dev into seperate packages.
2. Multilib builds set the package name (PN) to both foo and lib32-foo breaking
build.use BPN instead to get the Base package name.

Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>