for #155, osx(darwin) enable http api and stat, rusage is ok.

@@ -266,17 +266,8 @@ function OSX_prepare()
             echo "OSX detected, must specifies the --osx"
             exit 1
         fi
-        # TODO: FIXME: support following features.
-        if [ $SRS_HTTP_API = YES ]; then
-            echo "OSX does not support http-api, use --without-http-api"
-            exit 1
-        fi
-        if [ $SRS_STAT = YES ]; then
-            echo "OSX does not support stat, use --without-stat"
-            exit 1
-        fi
     fi
-    
+
     brew --help >/dev/null 2>&1; ret=$?; if [[ 0 -ne $ret ]]; then
         echo "install brew"
         echo "ruby -e \"$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)\""

@@ -592,12 +592,12 @@ function apply_user_presets() {
         SRS_FFMPEG_TOOL=NO
         SRS_TRANSCODE=YES
         SRS_INGEST=YES
-        SRS_STAT=NO
+        SRS_STAT=YES
         SRS_HTTP_PARSER=YES
         SRS_HTTP_CALLBACK=YES
         SRS_HTTP_SERVER=YES
         SRS_STREAM_CASTER=NO
-        SRS_HTTP_API=NO
+        SRS_HTTP_API=YES
         SRS_LIBRTMP=YES
         SRS_RESEARCH=NO
         SRS_UTEST=NO

@@ -836,6 +836,7 @@ int SrsServer::do_cycle()
                 srs_info("update resource info, rss.");
                 srs_update_system_rusage();
             }
+#ifndef SRS_OSX
             if ((i % SRS_SYS_CPU_STAT_RESOLUTION_TIMES) == 0) {
                 srs_info("update cpu info, cpu usage.");
                 srs_update_proc_stat();
@@ -869,6 +870,7 @@ int SrsServer::do_cycle()
             }
     #endif
 #endif
+#endif
             srs_info("server main thread loop");
         }
     }