[BUILD] add the USE_GETADDRINFO build option
This one is used to call getaddrinfo() to resolve IPv6 host names.
diff --git a/Makefile.osx b/Makefile.osx
index f60508e..f3ecdb8 100644
--- a/Makefile.osx
+++ b/Makefile.osx
@@ -77,6 +77,7 @@
# set some defines when needed.
# Known ones are -DENABLE_POLL
# - use -DTPROXY to compile with transparent proxy support.
+# - use -DUSE_GETADDRINFO to use of getaddrinfo() to resolve IPv6 host names
DEFINE = -DTPROXY
# May be changed to patch PAGE_SIZE on every platform when using dlmalloc