build: Also use stage0_cpu detection in bootstrap.sh build.

* build-aux/build-scaffold.sh: Include cflags.sh.
(stage0_cpu): Move to...
* build-aux/cflags.sh (stage0_cpu): ...here.
* build-aux/build.sh.in (stage0_cpu): Remove.

build-aux/build-scaffold.sh

@@ -1,7 +1,7 @@
 #! /bin/sh
 
 # GNU Mes --- Maxwell Equations of Software
-# Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+# Copyright © 2017,2018,2019,2022 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 #
 # This file is part of GNU Mes.
 #
@@ -29,6 +29,7 @@ fi
 
 . ./config.sh
 . ${srcdest}build-aux/trace.sh
+. ${srcdest}build-aux/cflags.sh
 
 if $courageous; then
     set +e
@@ -42,25 +43,6 @@ else
     }
 fi
 
-case "$mes_cpu" in
-    arm)
-        stage0_arch=40
-        stage0_cpu=armv7l
-        ;;
-    x86_64)
-        stage0_arch=2
-        stage0_cpu=amd64
-        ;;
-    x86)
-        stage0_arch=1
-        stage0_cpu=x86
-        ;;
-    *)
-        stage0_arch=1
-        stage0_cpu=$mes_cpu
-        ;;
-esac
-
 trace "CCLD       ${srcdest}lib/$mes_kernel/$mes_cpu-mes-$compiler/exit-42.S" $CC\
       -nostdlib\
       -g\

build-aux/build.sh.in

@@ -38,25 +38,6 @@ set -u
 . ./config.sh
 . ${srcdest}build-aux/cflags.sh
 
-case "$mes_cpu" in
-    arm)
-        stage0_arch=40
-        stage0_cpu=armv7l
-        ;;
-    x86_64)
-        stage0_arch=2
-        stage0_cpu=amd64
-        ;;
-    x86)
-        stage0_arch=1
-        stage0_cpu=x86
-        ;;
-    *)
-        stage0_arch=1
-        stage0_cpu=$mes_cpu
-        ;;
-esac
-
 if $courageous; then
     echo "Applying courage"
     set +e

build-aux/cflags.sh

@@ -1,5 +1,5 @@
 # GNU Mes --- Maxwell Equations of Software
-# Copyright © 2018,2019,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+# Copyright © 2018,2019,2020,2022 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 #
 # This file is part of GNU Mes.
 #
@@ -16,6 +16,25 @@
 # You should have received a copy of the GNU General Public License
 # along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
 
+case "$mes_cpu" in
+    arm)
+        stage0_arch=40
+        stage0_cpu=armv7l
+        ;;
+    x86_64)
+        stage0_arch=2
+        stage0_cpu=amd64
+        ;;
+    x86)
+        stage0_arch=1
+        stage0_cpu=x86
+        ;;
+    *)
+        stage0_arch=1
+        stage0_cpu=$mes_cpu
+        ;;
+esac
+
 AM_CPPFLAGS="
 -D HAVE_CONFIG_H=1
 -I ${srcdest}include