lode: make sure LODE_HOME/opt/bin is in the PATH for aclocal

When using a LODE setup, LODE_HOME must be defined in the environment
but setting LODE_HOME/opt/bin in the PATH is optional
and really only necessary as a convinience to get the right
'make' in the PATH.
configure.ac has code do deal with the absence of LODE_HOME/opt/bin
in the PATH but autogen.sh did not hence was failing in this
case, not finding aclocal.

Change-Id: I7a4449504dc539bb055798a6e1aea5268c5fb046
Reviewed-on: https://gerrit.libreoffice.org/21003Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>

autogen.sh

@@ -127,6 +127,18 @@ chomp $system;
 
 sanity_checks ($system) unless($system eq 'Darwin');
 
+# If we are running in a LODE env, make sure we find the right aclocal
+# by making sure that LODE_HOME/opt/bin is in the PATH
+if (defined $ENV{LODE_HOME})
+{
+    my $lode_path = quotemeta "$ENV{LODE_HOME}/opt/bin";
+    if($ENV{PATH} !~ $lode_path)
+    {
+        $ENV{PATH}="$ENV{LODE_HOME}/opt/bin:$ENV{PATH}";
+        print STDERR "add LODE_HOME/opt/bin in PATH\n";
+    }
+}
+
 my $aclocal_flags = $ENV{ACLOCAL_FLAGS};
 
 $aclocal_flags .= " -I $src_path/m4";