only apply -lregex for qnx710 and newer

Author: michaeldleslie

googletest/CMakeLists.txt

@@ -147,7 +147,7 @@ target_include_directories(gtest SYSTEM INTERFACE
 target_include_directories(gtest_main SYSTEM INTERFACE
   "$<BUILD_INTERFACE:${dirs}>"
   "$<INSTALL_INTERFACE:$<INSTALL_PREFIX>/${CMAKE_INSTALL_INCLUDEDIR}>")
-if(CMAKE_SYSTEM_NAME MATCHES "QNX")
+if(CMAKE_SYSTEM_NAME MATCHES "QNX" AND CMAKE_SYSTEM_VERSION VERSION_GREATER_EQUAL 7.1)
   target_link_libraries(gtest PUBLIC regex)
 endif()
 target_link_libraries(gtest_main PUBLIC gtest)