Fixed bug 2812 - Make libSDL2main.a usable on Android via a dummy symbol

Jonas Kulla

This eliminates the need to manually compile in SDL_main_android.c.
Instead, add "-lSDL2main -Wl,-u,SDL_main_dummy" when linking.

I don't know how the nkd-build process works, but unless it was
for some reason linking libSDL2main.a it should be unaffected.

 #!/bin/sh

 #

 # Regenerate configuration files

 cp acinclude.m4 aclocal.m4

 found=false

 for autoconf in autoconf autoconf259 autoconf-2.59

 do if which $autoconf >/dev/null 2>&1; then $autoconf && found=true; break; fi

 done

 if test x$found = xfalse; then

     echo "Couldn't find autoconf, aborting"

     exit 1

 fi