[Ada] Remove Digits_From_Size and Width_From_Size
gcc/ada/
* ada_get_targ.adb (Digits_From_Size): Delete.
(Width_From_Size): Likewise.
* get_targ.adb (Digits_From_Size): Likewise.
(Width_From_Size): Likewise.
* get_targ.ads (Digits_From_Size): Likewise.
(Width_From_Size): Likewise.
* ttypes.ads: Remove with clause for Get_Targ.
(Standard_Short_Short_Integer_Width): Delete.
(Standard_Short_Integer_Width): Likewise.
(Standard_Integer_Width): Likewise.
(Standard_Long_Integer_Width): Likewise.
(Standard_Long_Long_Integer_Width): Likewise.
(Standard_Long_Long_Long_Integer_Width): Likewise.
(Standard_Short_Float_Digits): Likewise.
(Standard_Float_Digits): Likewise.
(Standard_Long_Float_Digits): Likewise.
(Standard_Long_Long_Float_Digits): Likewise.
* gnat1drv.adb (Adjust_Global_Switches): Adjust.