Make has_lib.sh work properly on Debian 64 bit

util/has_lib.sh

@@ -2,13 +2,17 @@
 has_lib() {
   local regex="lib$1.+(so|dylib)$"
 
+  # Add /sbin to path as ldconfig is located there on some systems - e.g. Debian
+  # (and it still can be used by unprivileged users):
+  PATH="$PATH:/sbin"
+  export PATH
   # Try using ldconfig on linux systems
   for LINE in `which ldconfig > /dev/null && ldconfig -p 2>/dev/null | grep -E $regex`; do
     return 0
   done
 
   # Try just checking common library locations
-  for dir in /lib /usr/lib /usr/local/lib /opt/local/lib; do
+  for dir in /lib /usr/lib /usr/local/lib /opt/local/lib /usr/lib/x86_64-linux-gnu /usr/lib/i386-linux-gnu; do
     test -d $dir && ls $dir | grep -E $regex && return 0
   done