Move the libm .editorconfig to root

Author: tgross35

compiler-builtins/etc/libm/.editorconfig renamed to compiler-builtins/.editorconfig

@@ -12,10 +12,5 @@ insert_final_newline = true
 indent_style = space
 indent_size = 4
 
-[*.md]
-# double whitespace at end of line
-# denotes a line break in Markdown
-trim_trailing_whitespace = false
-
 [*.yml]
 indent_size = 2