RFR: 8281543: Remove unused code/headerfile dtraceAttacher.hpp

[Emanuel Peter]

`dtraceAttacher.cpp` with all the relevant definitions was deleted [here](https://github.com/openjdk/jdk/commit/071bd521bca2485c6df95c45e4310d39b05bd046)
in connection with [JDK-8244224](https://bugs.openjdk.java.net/browse/JDK-8244224) (Remove the Solaris and SPARC Ports).

I deleted `dtraceAttacher.cpp`, and the 4 include statements of it in 4 `src/hotspot/os/???/attachListener_???.cpp` files.

Ran tests, mostly to check that it still compiles on various platforms.

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Commit messages:
 - 8281543: Remove unused code/headerfile dtraceAttacher.hpp

Changes: https://git.openjdk.java.net/jdk/pull/7544/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7544&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281543
  Stats: 58 lines in 5 files changed: 0 ins; 55 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7544.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7544/head:pull/7544

PR: https://git.openjdk.java.net/jdk/pull/7544