Guard PACKAGE_PREFIX_DIR against being overwritten by child dependency

packaging/NetlibF2CConfig.cmake.in

@@ -25,6 +25,8 @@ SOFTWARE.
 
 @PACKAGE_INIT@
 
+set(NetlibF2C_PACKAGE_PREFIX_DIR "${PACKAGE_PREFIX_DIR}")
+
 cmake_minimum_required(VERSION @CMAKE_MINIMUM_REQUIRED_VERSION@)
 
 set(CMAKE_MAXIMUM_SUPPORTED_VERSION @CMAKE_MAXIMUM_SUPPORTED_VERSION@)
@@ -47,6 +49,8 @@ set(
 
 find_package(LoadStaticSharedTargets REQUIRED CONFIG)
 
+set(PACKAGE_PREFIX_DIR "${NetlibF2C_PACKAGE_PREFIX_DIR}")
+
 include(LoadStaticSharedTargets)
 
 load_static_shared_targets(