pythia8: patch latest 8.311 for upstream bug (#43803)

* pythia8: prefer 8.310

* [@spackbot] updating style on behalf of wdconinc

* pythia8: filter_file to remove sed n

* Revert "[@spackbot] updating style on behalf of wdconinc"

This reverts commit e2a3dec.

* Revert "pythia8: prefer 8.310"

This reverts commit 568cb05.

* [@spackbot] updating style on behalf of wdconinc

* pythia8: comment for fix

* pythia8: fix style

* pythia8: filter_file with raw string because of escaped pipe

---------

Co-authored-by: wdconinc <wdconinc@users.noreply.github.com>

var/spack/repos/builtin/packages/pythia8/package.py

@@ -134,6 +134,13 @@ def setup_cxxstd(self):
             r"-std=c\+\+[0-9][0-9]", f"-std=c++{self.spec.variants['cxxstd'].value}", "configure"
         )
 
+    # Fix for https://gitlab.com/Pythia8/releases/-/issues/428
+    @when("@:8.311")
+    def patch(self):
+        filter_file(
+            r"[/]examples[/]Makefile[.]inc\|;n' \\", "/examples/Makefile.inc|' \\", "configure"
+        )
+
     def configure_args(self):
         args = []