Slightly sped up the linux standalone bundle

Reduce the number of directories listed in libdirs, which makes the linker
check a lot less dead ends looking for directories.

Eliminated some directories that didn't really contain shared libraries,
or only contained the linker.

That left only 2, one in lib and one in usr/lib, so consolidate those two.

Doing it this way, rather than just consolidating all libs that might exist
into a single directory means that, if there are optimised versions of some
libs, eg in lib/subarch/foo.so, and lib/subarch2/foo.so, they don't get
moved around in a way that would make the linker pick the wrong one.

Utility/LinuxMkLibs.hs

@@ -1,6 +1,6 @@
 {- Linux library copier and binary shimmer
  -
- - Copyright 2013 Joey Hess <id@joeyh.name>
+ - Copyright 2013-2020 Joey Hess <id@joeyh.name>
  -
  - License: BSD-2-clause
  -}
@@ -9,6 +9,7 @@ module Utility.LinuxMkLibs (
 	installLib,
 	parseLdd,
 	glibcLibs,
+	gconvLibs,
 	inTop,
 ) where
 
@@ -59,9 +60,15 @@ parseLdd = mapMaybe (getlib . dropWhile isSpace) . lines
   where
 	getlib l = headMaybe . words =<< lastMaybe (split " => " l)
 
-{- Get all glibc libs and other support files, including gconv files
+{- Get all glibc libs.
  -
  - XXX Debian specific. -}
 glibcLibs :: IO [FilePath]
 glibcLibs = lines <$> readProcess "sh"
-	["-c", "dpkg -L libc6:$(dpkg --print-architecture) libgcc1:$(dpkg --print-architecture) | egrep '\\.so|gconv'"]
+	["-c", "dpkg -L libc6:$(dpkg --print-architecture) libgcc1:$(dpkg --print-architecture) | egrep '\\.so' | grep -v /gconv/ | grep -v ld.so.conf | grep -v sotruss-lib"]
+
+{- Get gblibc's gconv libs, which are handled specially.. -}
+gconvLibs :: IO [FilePath]
+gconvLibs = lines <$> readProcess "sh"
+	["-c", "dpkg -L libc6:$(dpkg --print-architecture) | grep /gconv/"]
+