Remove libgfortran4 from list of packages to be installed (current linux install issues)

Like with #70 (closed), we now have to also remove libgfortran4 from the list of packages during conda create or conflicts may be generated on Linux.

bob/devtools/build.py

@@ -297,6 +297,8 @@ def parse_dependencies(recipe_dir, config):
     # causes conflicts on macOS
     if "llvm-tools" in build_requirements:
         build_requirements.remove("llvm-tools")
+    if "libgfortran4" in build_requirements:
+        build_requirements.remove("libgfortran4")
     return (
         build_requirements
         + remove_pins(recipe["requirements"].get("host", []))