Change webkit source to https

Closes facebookarchive#18.

Author: lexs

fetch_sources.sh

@@ -13,7 +13,7 @@ echo "Extracting ICU"
 tar -zxf icu4c.tar.gz -C icu
 
 echo "Downloading JSC"
-curl -O http://builds.nightly.webkit.org/files/trunk/src/WebKit-r174650.tar.bz2
+curl -O https://builds-nightly.webkit.org/files/trunk/src/WebKit-r174650.tar.bz2
 
 echo "Extracting JSC"
 tar -jxf WebKit-r174650.tar.bz2 -C jsc --strip 2 WebKit-r174650/Source/JavaScriptCore WebKit-r174650/Source/WTF