Stop src_get overrides from propagating between builds

Because src_get was never unset at the end of a build, it would propagate to subsequent builds until it would be either overridden again, or cleared by a new bash process starting (either due to a jump step or a new version of bash being built).

Thus, kexec-linux's override of src_get to a no-op would stay in effect in chroot mode until musl-1.2.4 phase2's override restored src_get's functionality. This override is actually obsolete, since musl-1.2.4's source code is now preserved across the Linux kexec via a different mechanism - but removing it mysteriously broke downloading bash-5.2.15 due to kexec-linux's override still being in effect.

Author: Googulator

steps/helpers.sh

@@ -253,7 +253,7 @@ build() {
 
     cd "${SRCDIR}"
 
-    unset -f src_unpack src_prepare src_configure src_compile src_install src_postprocess
+    unset -f src_get src_unpack src_prepare src_configure src_compile src_install src_postprocess
     unset extract
 }