Update to Go 1.4rc1

Signed-off-by: Steeve Morin <steeve.morin@gmail.com>
Fix 64 bits builds on Windows

Signed-off-by: Steeve Morin <steeve.morin@gmail.com>
Add alldist rule on Makefile to build the library in all distributions

Signed-off-by: Steeve Morin <steeve.morin@gmail.com>
Remove debug flags in cgo

Signed-off-by: Steeve Morin <steeve.morin@gmail.com>
Fix cross compiling by using the compiler's triple

Signed-off-by: Steeve Morin <steeve.morin@gmail.com>