configure: Default missing options to False when preparing ghc-toolchain Targets

This commit fixes building ghc with 9.2 as the boostrap compiler.

The ghc-toolchain patch assumed all _STAGE0 options were available, and
forgot to account for this missing information in 9.2.

Ghc 9.2 does not have in settings whether ar supports -l, hence can't
report it with --info (unliked 9.4 upwards).

The fix is to default the missing information (we default "ar supports
-l" and other missing options to False)

Author: alt-romes

m4/prep_target_file.m4

@@ -58,7 +58,8 @@ AC_DEFUN([PREP_BOOLEAN],[
           $1Bool=False
           ;;
         *)
-          AC_MSG_WARN([m4/prep_target_file.m4: Expecting YES/NO but got $$1 in $1])
+          AC_MSG_WARN([m4/prep_target_file.m4: Expecting YES/NO but got $$1 in $1. Defaulting to False.])
+          $1Bool=False
           ;;
     esac
     AC_SUBST([$1Bool])
@@ -78,7 +79,8 @@ AC_DEFUN([PREP_NOT_BOOLEAN],[
           Not$1Bool=False
           ;;
         *)
-          AC_MSG_WARN([m4/prep_target_file.m4: Expecting YES/NO but got $$1 in $1])
+          AC_MSG_WARN([m4/prep_target_file.m4: Expecting YES/NO but got $$1 in $1. Defaulting to False.])
+          Not$1Bool=False
           ;;
     esac
     AC_SUBST([Not$1Bool])