feature: enable cl_cache by default on Linux

Resolves: NEO-4262

Signed-off-by: Kacper Kasper <kacper.k.kasper@intel.com>

shared/source/compiler_interface/linux/os_compiler_cache_helper.cpp

@@ -17,6 +17,10 @@
 #include <link.h>
 
 namespace NEO {
+int64_t defaultCacheEnabled() {
+    return 1l;
+}
+
 std::string makePath(const std::string &lhs, const std::string &rhs) {
     if (lhs.size() == 0) {
         return rhs;