Support building with DAOS on Debian based systems

A hard-coded library path of .../lib64 is being assumed for the library
location for DAOS.  This is unportable and does not work on Debian
based distros.

Instead, try to figure out if .../lib64 is the correct location or
.../lib/x86_64-linux-gnu is correct.

Signed-off-by: Brian J. Murrell <[email protected]>

Author: brianjmurrell

configure.ac

@@ -336,7 +336,12 @@ AC_ARG_WITH([daos],
     [], [with_daos=no])
 AS_IF([test "x$with_daos" != xno], [
     DAOS="yes"
-    LDFLAGS="$LDFLAGS -L$with_daos/lib64 -Wl,--enable-new-dtags -Wl,-rpath=$with_daos/lib64"
+    if test -d $with_daos/lib/x86_64-linux-gnu/; then
+        DAOS_LIB_DIR=$with_daos/lib/x86_64-linux-gnu
+    else
+        DAOS_LIB_DIR=$with_daos/lib64
+    fi
+    LDFLAGS="$LDFLAGS -L$DAOS_LIB_DIR -Wl,--enable-new-dtags -Wl,-rpath=$DAOS_LIB_DIR"
     CPPFLAGS="$CPPFLAGS -I$with_daos/include"
     AC_CHECK_HEADERS(gurt/common.h,, [unset DAOS])
     AC_CHECK_HEADERS(daos.h,, [unset DAOS])