bootstrap.bash: fix build if no exec wrapper exists
Since CL 170941 bootstrap.bash fails if no exec wrapper exists for a given GOOS/GOARCH yet: #### Building ../../go-linux-arm-bootstrap Building Go cmd/dist using /usr/local/go. Building Go toolchain1 using /usr/local/go. Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1. Building Go toolchain2 using go_bootstrap and Go toolchain1. Building Go toolchain3 using go_bootstrap and Go toolchain2. Building packages and commands for host, linux/amd64. Building packages and commands for target, linux/arm. rm: cannot remove 'bin/go_linux_arm_exec': No such file or directory Fix it by using 'rm -f' to ignore nonexisting files. Change-Id: Ib4b1e19747052fa4dca06319f35cc25a0545c4f7 Reviewed-on: https://go-review.googlesource.com/c/go/+/171722 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Elias Naur <mail@eliasnaur.com>
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