Not building on ubuntu 16.04

[joolzg]

gcc --version
gcc (Ubuntu 8.1.0-5ubuntu1~16.04) 8.1.0

make
rm -f arg_check.o
gcc -g -O2 -DHAVE_STDARG_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_UNISTD_H=1 -DHAVE_SYS_MMAN_H=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_W32API_WINBASE_H=0 -DHAVE_W32API_WINDEF_H=0 -DHAVE_SYS_CYGWIN_H=0 -DHAVE_SIGNAL_H=1 -I. -I. -c arg_check.c -o ./arg_check.o
In file included from /usr/include/string.h:630,
from arg_check.c:31:
dmalloc.h:482:7: error: expected identifier or ‘(’ before ‘extension’
char *strndup(const char *string, const DMALLOC_SIZE len);
^~~~~~~
Makefile:407: recipe for target 'arg_check.o' failed
make: *** [arg_check.o] Error 1

[j256]

Should be fixed by #13