compilers/fortran: Add "none" to intel compielrs for standards

Fixes mesonbuild#8023

Author: dcbaker

mesonbuild/compilers/fortran.py

@@ -315,7 +315,7 @@ def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoic
 
     def get_options(self) -> 'OptionDictType':
         opts = FortranCompiler.get_options(self)
-        opts['std'].choices = ['legacy', 'f95', 'f2003', 'f2008', 'f2018']  # type: ignore
+        opts['std'].choices = ['none', 'legacy', 'f95', 'f2003', 'f2008', 'f2018']  # type: ignore
         return opts
 
     def get_option_compile_args(self, options: 'OptionDictType') -> T.List[str]:
@@ -365,7 +365,7 @@ def __init__(self, exelist: T.List[str], version: str, for_machine: MachineChoic
 
     def get_options(self) -> 'OptionDictType':
         opts = FortranCompiler.get_options(self)
-        opts['std'].choices = ['legacy', 'f95', 'f2003', 'f2008', 'f2018']  # type: ignore
+        opts['std'].choices = ['none', 'legacy', 'f95', 'f2003', 'f2008', 'f2018']  # type: ignore
         return opts
 
     def get_option_compile_args(self, options: 'OptionDictType') -> T.List[str]: