Do not use the v8's embedded toolchain to compile it

This was causing issues (#227) due to the build system falling back to an old
version of binutils.

Author: ignisf

ext/libv8/builder.rb

@@ -29,8 +29,12 @@ def gyp_defines(*defines)
       # Do not use an external snapshot as we don't really care for binary size
       defines << 'v8_use_external_startup_data=0'
 
-      # Do not use the GPLv3 ld.gold binary on Linux
-      #defines << 'linux_use_bundled_gold=0'
+      # Do not use the embedded toolchain
+      defines << 'use_sysroot=0'
+      defines << 'linux_use_bundled_binutils=0'
+      defines << 'linux_use_bundled_gold=0'
+      defines << 'make_clang_dir=""'
+      defines << 'clang_dir=""'
 
       # Pass clang flag to GYP in order to work around GCC compilation failures
       defines << "clang=#{@compiler.is_a?(Compiler::Clang) ? '1' : '0'}"