alpha13 is rubbish on mac

.travis.yml

@@ -26,7 +26,7 @@ before_install:
   fi
 
 - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
-    curl --location --retry 5 https://github.com/premake/premake-core/releases/download/v5.0.0-alpha13/premake-5.0.0-alpha13-macosx.tar.gz | tar zfx -;
+    curl --location --retry 5 https://github.com/premake/premake-core/releases/download/v5.0.0-alpha12/premake-5.0.0-alpha12-macosx.tar.gz | tar zfx -;
   fi
 - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
     git clone https://github.com/DailyShana/irrlicht irrlicht_linux;

premake5.lua

@@ -45,7 +45,9 @@ solution "ygo"
 
     configuration { "Release", "vs*" }
         flags { "LinkTimeOptimization" }
+if not os.ishost("macosx") then
         staticruntime "On"
+end
         disablewarnings { "4244", "4267", "4838", "4577", "4819", "4018", "4996", "4477", "4091", "4305", "4828", "4800" }
 
     configuration { "Release", "not vs*" }