Remove g++ reference for bgl build, no longer required

BUILD.NOTES

@@ -52,7 +52,7 @@ BlueGene build notes:
    (.rpmrc for newer versions of rpmbuild) file containing:
 	%_slurm_sysconfdir      /etc/slurm
 	%_enable_debug         "--enable-debug"
-	%with_cflags		CFLAGS=-m64 CXX="g++ -m64"
+	%with_cflags		CFLAGS=-m64
    Build on Service Node with using the following syntax
    build -s https://eris.llnl.gov/svn/slurm/tags/slurm-1-2-0-0-pre3
  4. Copy RPMs to /usr/admin/sles/llnl/RPMS-SLES9