Remove -pipe from default list of args. Closes #8508.

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+## `-pipe` no longer used by default
+
+Meson used to add the `-pipe` command line argument to all compilers
+that supported it, but no longer does. If you need this, then you can
+add it manually. However note that you should not do this unless you
+have actually measured that it provides performance improvements. In
+our tests we could not find a case where adding `-pipe` made
+compilation faster and using `-pipe` [can cause sporadic build
+failures in certain
+cases](https://github.com/mesonbuild/meson/issues/8508).