Update and simplify Github Action for regression testing.

Author: davexparker

.gitattributes

@@ -0,0 +1,7 @@
+# Handle line endings automatically for text files
+* text=auto
+
+# Force LF for build scripts (for make etc. on Cygwin)
+*.sh      text eol=lf
+*.py      text eol=lf
+Makefile  text eol=lf

.github/workflows/make-tests.yml

@@ -1,4 +1,4 @@
-name: make-tests
+name: Regression tests
 
 on:
   push:
@@ -52,7 +52,6 @@ jobs:
           mingw64-x86_64-gcc-g++,
           binutils,
           dos2unix,
-          git,
           wget,
           unzip,
           python