Don't add NONE/bin to the path - inexplicably fixes building on mingw+msys, apparently

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401714

sdl.m4

@@ -32,7 +32,9 @@ AC_ARG_ENABLE(sdltest, [  --disable-sdltest       Do not try to compile and run
     fi
   fi
 
+  if test "x$prefix" != xNONE; then
     PATH="$prefix/bin:$prefix/usr/bin:$PATH"
+  fi
   AC_PATH_PROG(SDL_CONFIG, sdl-config, no, [$PATH])
   min_sdl_version=ifelse([$1], ,0.11.0,$1)
   AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)

test/acinclude.m4

@@ -32,7 +32,9 @@ AC_ARG_ENABLE(sdltest, [  --disable-sdltest       Do not try to compile and run
     fi
   fi
 
+  if test "x$prefix" != xNONE; then
     PATH="$prefix/bin:$prefix/usr/bin:$PATH"
+  fi
   AC_PATH_PROG(SDL_CONFIG, sdl-config, no, [$PATH])
   min_sdl_version=ifelse([$1], ,0.11.0,$1)
   AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)