cmd/errtrace: Fix toolexec with go run main.go
#94
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When compiling files passed as command line arguments, go uses a special
package name, "command-line-arguments". Similarly for tests, it uses
"command-line-arguments.test".
Rather than hardcoding these special package names, let's update the
stdlib detection to:
Update the toolexec tests to compile with files passed directly on the
command line, and verify both "go run" and "go build".