Override the link templates to use g++ as the linker

rebar.config

@@ -8,6 +8,8 @@
 
 {port_env, [
     {".*", "FLTO_FLAG", ""},
+    {".*", "EXE_LINK_TEMPLATE", "$CXX $PORT_IN_FILES $LDFLAGS $EXE_LDFLAGS -o $PORT_OUT_FILE"},
+    {".*", "DRV_LINK_TEMPLATE", "$CXX $PORT_IN_FILES $LDFLAGS $DRV_LDFLAGS -o $PORT_OUT_FILE"},
 
     {"(linux|solaris|freebsd|netbsd|openbsd|dragonfly|darwin|gnu)",
         "CFLAGS", "$CFLAGS -Ic_src/ -g -Wall $FLTO_FLAG -Werror -O3"},
@@ -36,7 +38,7 @@
     verbose
 ]}.
 
-{project_plugins, [{pc, "~> 1.0"}]}.
+{plugins, [{pc, "~> 1.0"}]}.
 {artifacts, ["priv/jiffy.so"]}.
 {provider_hooks, [
     {post,