Compilation error in glob.c with gcc 4.8

[Reuben Thomas]

I'm getting the following error on Ubuntu 14.04 with gcc 4.8, current gnulib:

In file included from ./scratch_buffer.h:4:0,
                 from glob.c:81:
./malloc/scratch_buffer.h:95:1: warning: return type defaults to ‘int’ [enabled by default]
 libc_hidden_proto (__libc_scratch_buffer_grow)
 ^
./malloc/scratch_buffer.h: In function ‘libc_hidden_proto’:
./malloc/scratch_buffer.h:100:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘{’ token
 {
 ^
./malloc/scratch_buffer.h:107:1: error: expected declaration specifiers before ‘libc_hidden_proto’
 libc_hidden_proto (__libc_scratch_buffer_grow_preserve)
 ^

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