Use GNU ld to link roms on OpenSolaris

OpenSolaris ld seems to miss the equivalent of GNU ld's "-Ttext 0".

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/configure b/configure
index fb5b6bb..480c81d 100755
--- a/configure
+++ b/configure
@@ -299,6 +299,7 @@
   solaris="yes"
   make="gmake"
   install="ginstall"
+  ld="gld"
   needs_libsunmath="no"
   solarisrev=`uname -r | cut -f2 -d.`
   # have to select again, because `uname -m` returns i86pc