Stash the uClibc config after our mods

... before running `make olddefconfig`. This helps in debugging.

Signed-off-by: Alexey Neyman <stilor@att.net>

scripts/build/libc/uClibc.sh

@@ -404,6 +404,10 @@ manage_uClibc_config()
     # Now allow architecture to tweak as it wants
     CT_DoArchUClibcConfig "${dst}"
     CT_DoArchUClibcCflags "${dst}" "${flags}"
+
+    # Preserve the config we created (before uclibc's `make olddefconfig`
+    # overrides anything).
+    CT_DoExecLog ALL cp "${dst}" "${dst}.created-by-ct-ng"
 }
 
 uClibc_post_cc()