development/device-tree-compiler: Add a fix for gcc >= 10.x.

Signed-off-by: Matteo Bernardini <ponce@slackbuilds.org>

development/device-tree-compiler/device-tree-compiler.SlackBuild

@@ -70,7 +70,7 @@ find -L . \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
 make clean
-make CFLAGS="$SLKCFLAGS" PREFIX=/usr LIBDIR=/usr/lib${LIBDIRSUFFIX}
+make CFLAGS="$SLKCFLAGS -w -Wl,--allow-multiple-definition" PREFIX=/usr LIBDIR=/usr/lib${LIBDIRSUFFIX}
 make install PREFIX=/usr LIBDIR=/usr/lib${LIBDIRSUFFIX} DESTDIR=$PKG
 
 find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \