llvm-3.4: Try to fix build on darwin

Signed-off-by: Shea Levy <shea@shealevy.com>
llvm-general: Fix build

Signed-off-by: Shea Levy <shea@shealevy.com>
clang: Fix linking with -flto

Signed-off-by: Shea Levy <shea@shealevy.com>
idris requires llvm-general-3.3 currently

Signed-off-by: Shea Levy <shea@shealevy.com>
pidgin: bugfix 2.10.8 -> .9

Fixes connection to some servers broken by the previous update.
arp-scan: new package

Arp-scan is a command-line tool that uses the ARP protocol to discover
and fingerprint IP hosts on the local network.

http://www.nta-monitor.com/tools-resources/security-tools/arp-scan
sqliteodbc: fix library location

Commit d7d3c8fd828cf6aba4d511be1927458507422a67 (sqliteodbc: update to
0.995, add more metadata) mistakenly moved libraries from $out/lib to
$out (or rather stopped moving them from $out to $out/lib).

Move them back to $out/lib where they're expected to be and referred to
by the /etc/odbcinst.ini snippet.
silver-searcher: updated to 0.19.2

Also fixed the "libgcc_s.so.1 must be installed for pthread_cancel to
work" problem.
proofgeneral: fix build with earlier version of texinfo.