BUG: incorrect kahip resolution with absolute paths (closes #1003)

- for installations with central (non-ThirdParty) location for KAHIP
  (eg, spack, EasyBuild)

wmake/scripts/have_kahip

@@ -83,10 +83,10 @@ have_kahip()
         # FOAM_EXT_LIBBIN is allowed to be unset
         library=$(findFirstFile \
             $FOAM_EXT_LIBBIN/$library \
-            $METIS_ARCH_PATH/lib/$static \
-            $METIS_ARCH_PATH/lib/$library \
-            $METIS_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH/$static \
-            $METIS_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH/$library \
+            $KAHIP_ARCH_PATH/lib/$static \
+            $KAHIP_ARCH_PATH/lib/$library \
+            $KAHIP_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH/$static \
+            $KAHIP_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH/$library \
         )
     elif isSystem "$KAHIP_ARCH_PATH"
     then