This update for go1.15 fixes the following issues:

- go1.15.8 (released 2021-02-04) includes fixes to the compiler, linker, runtime, the go command, and the net/http package.
* go#43861 cmd/go: TestScript/get_update_unknown_protocol test fails
* go#43860 cmd/go: handle space in path to C compiler
* go#43833 runtime: SIGSEGV in runtime.deltimer on linux-mips-rtrk during ReadMemStats
* go#43797 cmd/go: TestScript/mod_get_fallback relies on x/tools not being tagged
* go#43793 internal/execabs: disable tests on js-wasm
* go#43575 cmd/compile: 32-bit random data corruption
* go#43406 x/mobile/cmd/gomobile: gomobile build on simple program returns "ld: error: duplicate symbol: x_cgo_inittls"
* go#43214 cmd/link: panic: runtime error: slice bounds out of range [::1751306] with length 1048576
* go#42539 net/http: race in http2Transport
* go#42384 cmd/link: PE linker segfaults in addpersrc when cross-compiling

This update was imported from the SUSE:SLE-15:Update update project.