When JRE is not compatible with OS error message is tricky to understand

When trying to launch using a Unix JRE on OSX go-java-launcher fails with the following error:

panic: exec format error

goroutine 1 [running]:
panic(0x166760, 0xc8200baa50)
	/usr/local/go/src/runtime/panic.go:481 +0x3e6
github.com/palantir/go-java-launcher/launchlib.execWithChecks(0xc8200cc090, 0x24, 0xc8200e0600, 0x8, 0xc)
	/home/ubuntu/.go_workspace/src/github.com/palantir/go-java-launcher/launchlib/launcher.go:93 +0x27a
github.com/palantir/go-java-launcher/launchlib.Launch(0xc8200b9e48, 0xc8200b9e18)
	/home/ubuntu/.go_workspace/src/github.com/palantir/go-java-launcher/launchlib/launcher.go:83 +0xe38
main.LaunchWithConfig(0x7fff5fbff9b2, 0x1f, 0x7fff5fbff9d2, 0x1c)
	/home/ubuntu/.go_workspace/src/github.com/palantir/go-java-launcher/go-java-launcher/main.go:39 +0x389
main.main()
	/home/ubuntu/.go_workspace/src/github.com/palantir/go-java-launcher/go-java-launcher/main.go:56 +0xf6

Very hard to debug. Would be nice to fail with a much easier to understand error.

Start at launchlib/launcher.go:93, where the stack trace shows execWithChecks handling the failed launch. Trace how Launch and the main entry point propagate this failure, then define completion as reporting an understandable error instead of the raw exec format panic when the JRE is incompatible with the OS.