Specify build dir also for non-editable installs (and fix typo)

Author: tobiasdiez

build/pkgs/sagelib/spkg-install.in

@@ -60,7 +60,7 @@ else
     (cd "$SITEPACKAGESDIR" && rm -f sagemath-standard.egg-link)
     # Use --no-build-isolation to avoid rebuilds because of dependencies:
     # Compiling sage/interfaces/sagespawn.pyx because it depends on /private/var/folders/38/wnh4gf1552g_crsjnv2vmmww0000gp/T/pip-build-env-609n5985/overlay/lib/python3.10/site-packages/Cython/Includes/posix/unistd.pxd
-    sdh_pip_install --no-build-isolation . --config-settings=setup-args="-DSAGE_LOCAL=$SAGE_LOCAL"
+    sdh_pip_install --no-build-isolation . --config-setting=build-dir="build/sage-distro" --config-setting=setup-args="-DSAGE_LOCAL=$SAGE_LOCAL"
 fi
 
 # Remove (potentially invalid) star import caches.