Merge pull request XRPLF#29 from sepeth/fix-shared-lib-build

Build shared lib and put linker flags to the end

Author: igorcanadi

Makefile

@@ -127,7 +127,7 @@ $(SHARED2): $(SHARED3)
 endif
 
 $(SHARED3):
-	$(CXX) $(LDFLAGS) $(PLATFORM_SHARED_LDFLAGS)$(SHARED2) $(CXXFLAGS) $(COVERAGEFLAGS) $(PLATFORM_SHARED_CFLAGS) $(SOURCES) -o $(SHARED3)
+	$(CXX) $(PLATFORM_SHARED_LDFLAGS)$(SHARED2) $(CXXFLAGS) $(COVERAGEFLAGS) $(PLATFORM_SHARED_CFLAGS) $(SOURCES) -o $@ $(LDFLAGS)
 
 endif  # PLATFORM_SHARED_EXT