Merge bitcoin#533: [Doc] Update OSX build notes: zmq, libevent, and notes to handle possible glibtoolize error

fde9f94 osx build notes: libzmq -> zmq in brew install, add libevent (Tim Uy)

Tree-SHA512: eb44a499c3f42da2a296161bc01be49cd63fbd928c513018010a564cd1192e1000beb1987d536f4ab93782cd2930527552108418e973448c80e6c5a59c2a78ef

Author: Fuzzbawls

doc/build-osx.md

@@ -38,7 +38,7 @@ Instructions: Homebrew
 
 #### Install dependencies using Homebrew
 
-        brew install autoconf automake berkeley-db4 libtool boost miniupnpc openssl pkg-config protobuf qt5 libzmq
+        brew install autoconf automake berkeley-db4 libtool boost miniupnpc openssl pkg-config protobuf qt5 zmq libevent
 
 ### Building `pivxd`