MDEV-13946 Server RPMs have dependency on "which"

SLES11 doesn't have a dedicated package for "which",
it's part of the "util-linux" package

cmake/cpack_rpm.cmake

@@ -168,9 +168,14 @@ SETA(CPACK_RPM_server_PACKAGE_REQUIRES
   "MariaDB-client")
 
 IF(WITH_WSREP)
-SETA(CPACK_RPM_server_PACKAGE_REQUIRES
-  "galera" "rsync" "lsof" "grep" "gawk" "iproute"
-  "coreutils" "findutils" "tar" "which")
+  SETA(CPACK_RPM_server_PACKAGE_REQUIRES
+    "galera" "rsync" "lsof" "grep" "gawk" "iproute"
+    "coreutils" "findutils" "tar")
+  IF (RPM MATCHES "sles11")
+    SETA(CPACK_RPM_server_PACKAGE_REQUIRES "util-linux")
+  ELSE()
+    SETA(CPACK_RPM_server_PACKAGE_REQUIRES "which")
+  ENDIF()
 ENDIF()
 
 SET(CPACK_RPM_server_PRE_INSTALL_SCRIPT_FILE ${CMAKE_SOURCE_DIR}/support-files/rpm/server-prein.sh)