Always include polarssl in dist

This is necessary since POLARSSL_SUBDIR
can be empty when configuring --with-system-polarssl, running
make distdir and building an rpm from that distdir afterwards.
Rename pdns init script to pdns.init
Merge pull request #1781 from rubenk/rename-pdns-init-script

Rename pdns init script to pdns.init
Merge pull request #1780 from rubenk/always-include-polarssl-in-distfile

Always include polarssl in dist
Replace autoconf variable with automake variable
Add libraries with _LDADD
Add libdl to _LDADD instead of _LDFLAGS
Break up long lines
Don't add generated sources to _SOURCES
Conditionalize sqlite libs
Move some stuff up

No functional changes
Remove unneeded flags from tools
Remove some trailing whitespace