better fix for unused variable in Random/Randomize.h

ChangeLog

 ==============================
-12.06.15 Release CLHEP-2.2.0.8
+18.06.15 Release CLHEP-2.2.0.8
 ==============================
 
+2015-06-18 Lynn Garren <garren@fnal.gov> 
+
+  * Random/Random/Randomize.h: use __attribute__((unused)) for gcc
+
 2015-06-12 Lynn Garren <garren@fnal.gov> 
 
   * Random/Random/RandGauss.h, Random/src/RandGauss.cc:

Random/Random/Randomize.h

@@ -59,14 +59,6 @@
 #include "CLHEP/Random/RandPoissonT.h"
 #include "CLHEP/Random/RandSkewNormal.h"
 #include "CLHEP/Random/RandStudentT.h"
-
-#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 6)
-  #pragma GCC diagnostic push
-  #pragma GCC diagnostic ignored "-Wunused-variable"
-#elif __clang__
-  #pragma clang diagnostic push
-  #pragma clang diagnostic ignored "-Wunused-variable"
-#endif
 namespace CLHEP {
 
 #define HepUniformRand() HepRandom::getTheEngine()->flat()
@@ -74,17 +66,14 @@ namespace CLHEP {
 // On some compilers the static instance of the HepRandom generator
 // needs to be created explicitly in the client code (i.e. here).
 
+#if __GNUC__
+static const int HepRandomGenActive __attribute__((unused)) = HepRandom::createInstance();
+#else
 static const int HepRandomGenActive = HepRandom::createInstance();
-
+#endif
 
 }  // namespace CLHEP
 
-#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 6)
-  #pragma GCC diagnostic pop
-#elif __clang__
-  #pragma clang diagnostic pop
-#endif
-
 #ifdef ENABLE_BACKWARDS_COMPATIBILITY
 //  backwards compatibility will be enabled ONLY in CLHEP 1.9
 using namespace CLHEP;