syscall: correctly generate accept on linux/arm

CL 457995 introduced syscall_linux_accept.go which is used on linux/arm
to generate accept and use it in Accept. However, that CL forgot to
include the file in the list of files used with mksyscall.pl to generate
the syscall wrappers. This lead to accept no longer being generated when
re-running mkall.sh on linux/arm.

Change-Id: I7747399afae47a883a7fb079c82e835b90f366cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/529055
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Reviewed-by: Bryan Mills <[email protected]>
Run-TryBot: Tobias Klauser <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Commit-Queue: Tobias Klauser <[email protected]>
Auto-Submit: Tobias Klauser <[email protected]>

Author: tklauser

src/syscall/mkall.sh

@@ -190,6 +190,7 @@ linux_amd64)
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 linux_arm)
+	GOOSARCH_in="syscall_linux_arm.go syscall_linux_accept.go"
 	mkerrors="$mkerrors"
 	mksyscall="./mksyscall.pl -l32 -arm"
 	mksysnum="curl -s 'http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/arch/arm/include/uapi/asm/unistd.h' | ./mksysnum_linux.pl -"