Revert "sdksyms: Tighten up the symbols we add to the magic table"

Enough people are reporting build issues pointing at this commit that
it's not worth the benefit.

This reverts commit 3dad57b121.

hw/xfree86/sdksyms.sh

@@ -356,10 +356,6 @@ BEGIN {
            n = 1;
         }
 
-        # only match _X_EXPORT
-        if ($n !~ /^(__attribute__..visibility..default|__global)/)
-            next;
-
 	# skip attribute, if any
 	while ($n ~ /^(__attribute__|__global)/ ||
 	    # skip modifiers, if any