Run of lintian-fixes for golang-golang-x-exp

Try this locally (using the lintian-brush package):

debcheckout golang-golang-x-exp
cd golang-golang-x-exp
lintian-brush
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ok  	golang.org/x/exp/rand	1.490s
=== RUN   TestScanForwards
--- PASS: TestScanForwards (0.00s)
=== RUN   TestScanBackwards
--- PASS: TestScanBackwards (0.00s)
=== RUN   TestRandomAccess
--- PASS: TestRandomAccess (0.05s)
=== RUN   TestRandomSliceAccess
--- PASS: TestRandomSliceAccess (0.11s)
=== RUN   TestLimitSliceAccess
--- PASS: TestLimitSliceAccess (0.00s)
PASS
ok  	golang.org/x/exp/utf8string	0.161s
dh_auto_test: cd obj-x86_64-linux-gnu && go test -vet=off -v -p 4 golang.org/x/exp/ebnf golang.org/x/exp/ebnflint golang.org/x/exp/io/i2c golang.org/x/exp/io/i2c/driver golang.org/x/exp/io/i2c/example/displayip golang.org/x/exp/io/spi golang.org/x/exp/io/spi/driver golang.org/x/exp/mmap golang.org/x/exp/old/netchan golang.org/x/exp/rand golang.org/x/exp/utf8string returned exit code 1
make: *** [debian/rules:18: build] Error 1
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2

Summary

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