Kill warnings in Armadillo detection code to make compiler output empty
---- gdal-1.11.0/configure.in.orig 2014-06-14 15:45:50.005039893 +0200
-+++ gdal-1.11.0/configure.in 2014-06-14 16:46:47.261630331 +0200
+--- gdal-1.11.0/configure.ac.orig 2014-06-14 15:45:50.005039893 +0200
++++ gdal-1.11.0/configure.ac 2014-06-14 16:46:47.261630331 +0200
@@ -4227,7 +4227,7 @@
rm -f testarmadillo.*
rm -f testarmadillo