fix.sh in checkoff-0.35.1 vs fix.sh in checkoff-0.36.0

@@ -122,21 +122,11 @@
 
   ensure_ruby_build_requirements
 
   for ver in $ruby_versions
   do
-    # These CFLAGS can be retired once 2.6.7 is no longer needed :
-    #
-    # https://github.com/rbenv/ruby-build/issues/1747
-    # https://github.com/rbenv/ruby-build/issues/1489
-    # https://bugs.ruby-lang.org/issues/17777
-    if [ "${ver}" == 2.6.7 ]
-    then
-      CFLAGS="-Wno-error=implicit-function-declaration" rbenv install -s "${ver}"
-    else
-      rbenv install -s "${ver}"
-      hash -r  # ensure we are seeing latest bundler etc
-    fi
+    rbenv install -s "${ver}"
+    hash -r  # ensure we are seeing latest bundler etc
   done
 }
 
 ensure_bundle() {
   # Not sure why this is needed a second time, but it seems to be?