This go update to version 1.6 fixes the following issues:

Security issues fixed:
- CVE-2016-3959: Infinite loop in several big integer routines (boo#974232)
- CVE-2015-8618: Carry propagation in Int.Exp Montgomery code in math/big library (boo#960151)

Bugs fixed:
- Update to version 1.6:
* On Linux on little-endian 64-bit PowerPC (linux/ppc64le), Go 1.6 now supports cgo with external linking and is roughly feature complete.
* Vendoring support
* HTTP2 transparent support
* fix gc and gccgo incompatibility regarding embedded unexported struct types containing exported fields
* Linux on 64-bit MIPS and Android on 32-bit x86
* enforced rules for sharing Go pointers with C
* new mechanism for template reuse
* performance improvements
... and more!
see more in https://tip.golang.org/doc/go1.6
- Updated to version 1.5.2:
This release includes bug fixes to the compiler,
linker, and the mime/multipart, net, and runtime packages.
https://golang.org/doc/devel/release.html#go1.5.minor
- Updated to version 1.5.1:
This release includes bug fixes to the go command,
the compiler, assembler, and the fmt, net/textproto,
net/http, and runtime packages.
https://golang.org/doc/devel/release.html#go1.5.minor
- Update to version 1.5:
* see https://golang.org/doc/go1.5
- install shared stdlib on x86_64
- add go.gdbinit for debug friendly
- Adapt to Leap
* use gcc5-go than go1.4 is the proper requirement for Leap