monet.m4: - in the hardware counters test AC_CHECK_HEADERS made nested calls, i.e.   AC_CHECK_HEADERS(...,...,AC_CHECK_HEADERS(...)), with RedHat 8.0 or   more specifically autoconf 2.53 this is broken leading to a mangled   configure script, so unnested the AC_CHECK_HEADERS calls.
monet.m4:
- in the hardware counters test AC_CHECK_HEADERS made nested calls, i.e.
  AC_CHECK_HEADERS(...,...,AC_CHECK_HEADERS(...)), with RedHat 8.0 or
  more specifically autoconf 2.53 this is broken leading to a mangled
  configure script, so unnested the AC_CHECK_HEADERS calls.

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb