configure: add support for level-zero.pc

My upstream PR was merged a couple hours ago, let's support it,
even if we don't know when it'll be included in official packages
and/or whether le .pc might be renamed in the meantime.

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

config/hwloc.m4

@@ -1191,14 +1191,20 @@ return clGetDeviceIDs(0, 0, 0, NULL, NULL);
     # LevelZero support
     hwloc_levelzero_happy=no
     if test "x$enable_io" != xno && test "x$enable_levelzero" != "xno"; then
-      hwloc_levelzero_happy=yes
-      AC_CHECK_HEADERS([ze_api.h], [
-        AC_CHECK_LIB([ze_loader], [zeInit], [
-          AC_CHECK_HEADERS([zes_api.h], [
-            AC_CHECK_LIB([ze_loader], [zesDevicePciGetProperties], [HWLOC_LEVELZERO_LIBS="-lze_loader"], [hwloc_levelzero_happy=no])
+      HWLOC_PKG_CHECK_MODULES([LEVELZERO], [level-zero], [zesDevicePciGetProperties], [zes_api.h],
+                              [hwloc_levelzero_happy=yes
+			       HWLOC_LEVELZERO_REQUIRES=level-zero
+			      ], [hwloc_levelzero_happy=no])
+      if test x$hwloc_levelzero_happy = xno; then
+        hwloc_levelzero_happy=yes
+        AC_CHECK_HEADERS([ze_api.h], [
+          AC_CHECK_LIB([ze_loader], [zeInit], [
+            AC_CHECK_HEADERS([zes_api.h], [
+              AC_CHECK_LIB([ze_loader], [zesDevicePciGetProperties], [HWLOC_LEVELZERO_LIBS="-lze_loader"], [hwloc_levelzero_happy=no])
+            ], [hwloc_levelzero_happy=no])
           ], [hwloc_levelzero_happy=no])
         ], [hwloc_levelzero_happy=no])
-      ], [hwloc_levelzero_happy=no])
+      fi
     fi
     AC_SUBST(HWLOC_LEVELZERO_LIBS)
     # If we asked for LevelZero support but couldn't deliver, fail