Revert to autoconf 2.71 for tests

Author: natefoo

configure.ac

@@ -1,5 +1,5 @@
 AC_INIT([DRMAA for Slurm],[m4_esyscmd_s(./m4/ac_version.sh)],[nate@bx.psu.edu],[slurm-drmaa])
-AC_PREREQ([2.72])
+AC_PREREQ([2.71])
 AC_REVISION([m4_esyscmd_s([git rev-parse HEAD])])
 AC_COPYRIGHT([
 DRMAA for Slurm
@@ -50,7 +50,6 @@ AC_PROG_MAKE_SET
 AC_PROG_LN_S
 
 # check compiler / set basic flags:
-
 if test x$GCC = xyes; then
 	CFLAGS="-pedantic -std=c99 ${CFLAGS}"
 fi