wayland-egl: Ignore underscored symbols in ABI check

Rather than a hard-coded list of platform symbols, just ignore anything
prefaced with an underscore. This fixes breakage on ARM, which declares
several slightly different platform symbols to x86.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Fixes: 21b1f22eb0 ("wayland-egl: enhance the symbol test")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105620
Cc: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>

egl/wayland-egl-symbols-check

@@ -16,14 +16,6 @@ fi
 
 AVAIL_FUNCS="$($NM -D --format=bsd --defined-only $LIB | awk '{print $3}')"
 
-# Platform specific symbols.
-PLAT_FUNCS="__bss_start
-_edata
-_end
-_fini
-_init
-"
-
 # Official ABI, taken from the header.
 REQ_FUNCS="wl_egl_window_resize
 wl_egl_window_create
@@ -32,8 +24,8 @@ wl_egl_window_get_attached_size
 "
 
 NEW_ABI=$(echo "$AVAIL_FUNCS" | while read func; do
+    echo "$func" | grep -q "^_" && continue
     echo "$REQ_FUNCS" | grep -q "^$func$" && continue
-    echo "$PLAT_FUNCS" | grep -q "^$func$" && continue
 
     echo $func
 done)