www/firefox (r315793, 20.0.1) does not compile

[Matthias Apitz]

# cd /usr/ports/www/firefox
# svn up
# make install BATCH=yes
...
/usr/ports/www/firefox/work/mozilla-release/memory/mozalloc/mozalloc.cpp:214:12:
error: 
      use of undeclared identifier 'malloc_usable_size'; did you mean
      'moz_malloc_usable_size'?
    return malloc_usable_size(ptr);
           ^~~~~~~~~~~~~~~~~~
           moz_malloc_usable_size
/usr/ports/www/firefox/work/mozilla-release/memory/mozalloc/mozalloc.cpp:206:1:
note: 
      'moz_malloc_usable_size' declared here
moz_malloc_usable_size(void *ptr)

HIH

	matthias
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