Do not include host paths when cross-compiling.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>

diff -uNr pure-ftpd-1.0.36.org/configure pure-ftpd-1.0.36/configure
--- pure-ftpd-1.0.36.org/configure	2012-03-16 06:29:23.000000000 +0100
+++ pure-ftpd-1.0.36/configure	2014-09-28 19:55:56.650529713 +0200
@@ -6319,17 +6319,6 @@
 
 
 
-if test -d /usr/local/include; then
-  CPPFLAGS="$CPPFLAGS -I/usr/local/include"
-fi
-
-if test -d /usr/kerberos/include; then
-  CPPFLAGS="$CPPFLAGS -I/usr/kerberos/include"
-fi
-
-if test -d /usr/local/lib; then
-  LDFLAGS="$LDFLAGS -L/usr/local/lib"
-fi
 
 if uname | fgrep SunOS > /dev/null 2> /dev/null ; then
   CPPFLAGS="$CPPFLAGS -D_XPG4_2=1"