Force prereq again in SDK in order to fix GCC and Python dangling
symlinks:
 staging_dir/host/bin/g++ -> /builder/ath79_generic/ccache_cxx.sh
 staging_dir/host/bin/gcc -> /builder/ath79_generic/ccache_cc.sh
 staging_dir/host/bin/python -> /usr/bin/python3.5
 staging_dir/host/bin/python3 -> /usr/bin/python3.5
Ref: FS#2424
Signed-off-by: Petr Štetiar <ynezz@true.cz>
(cherry picked from commit 
		
	
					 | 
			||
|---|---|---|
| .. | ||
| files | ||
| Config.in | ||
| convert-config.pl | ||
| Makefile | ||