Update dictionary.c

Fixed a compilation error of dictionary.c on my 32bit Ubuntu. Here's the compilation log:

gcc -O3 src/dictionary.c src/match.c src/commands.c -o dictionary
src/dictionary.c:104:13: error: static declaration of ‘print_arg_quoted’ follows non-static declaration
src/dictionary.c:65:6: note: previous declaration of ‘print_arg_quoted’ was here
src/commands.c: In function ‘get_command’:
src/commands.c:50:12: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result]
make: *** [dictionary] Error 1