NetBpfLoad - change BPFLOADER_VERSION macro into an argument

(in preparation for this being run-time dynamic)

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Icac8d1afdd3d55b80c232dd5a124a79a9063f350
diff --git a/netbpfload/loader.h b/netbpfload/loader.h
index b884637..4da6830 100644
--- a/netbpfload/loader.h
+++ b/netbpfload/loader.h
@@ -70,7 +70,8 @@
 };
 
 // BPF loader implementation. Loads an eBPF ELF object
-int loadProg(const char* elfPath, bool* isCritical, const Location &location = {});
+int loadProg(const char* elfPath, bool* isCritical, const unsigned int bpfloader_ver,
+             const Location &location = {});
 
 // Exposed for testing
 unsigned int readSectionUint(const char* name, std::ifstream& elfFile, unsigned int defVal);