build: Fix deb build issues with fakeroot

If DESTDIR is set, don't call ldconfig. Assume that DESTDIR is used to
create a binary archive. The ldconfig call should be delegated to the
archive postinst script. This fixes the case where fakeroot wraps 'make
install' causing $EUID to be 0 even though it doesn't have permission to
call ldconfig.

The previous logic in configure.ac to detect and correct libdir
has been removed as it was not completely accurate.  CentOS 64-bit
users should again specifiy --libdir=/usr/lib64 when configuring
to prevent install to /usr/lib.

Updated Makefile:check-old-libdir to check for orphans in
lib64 when installing to lib as well as orphans in lib when installing
to lib64.

Updated Makefile and main/Makefile uninstall targets to remove the
orphans using the new logic.

ASTERISK-26705

Change-Id: I51739d4a03e60bff38be719b8d2ead0007afdd51

configure.ac

@@ -135,27 +135,6 @@ if test ${prefix} = ${ac_default_prefix} || test ${prefix} = 'NONE'; then
      fi
 fi
 
-#
-# The following code for detecting lib64 was taken from Fedora's
-# /usr/share/config.site with a modification to check that the
-# /usr/lib64 directory actually exists.  This prevents libdir from
-# being set to /usr/lib64 on 64-bit systems that still use /usr/lib.
-#
-if test "$prefix" = /usr ||\
-     { test "$prefix" = NONE && test "$ac_default_prefix" = /usr ; }
-then
-     for i in x86_64 ppc64 s390x aarch64; do
-        if test $host_cpu = $i; then
-           if test "$libdir" = '${exec_prefix}/lib' &&\
-              { test -d "${exec_prefix}/lib64" || test -d "${ac_default_prefix}/lib64" ; } ; then
-              libdir='${exec_prefix}/lib64'
-              AC_MSG_NOTICE([ Setting libdir=${libdir} ])
-           fi
-           break
-        fi
-     done
-fi
-
 BUILD_PLATFORM=${build}
 BUILD_CPU=${build_cpu}
 BUILD_VENDOR=${build_vendor}