Fix 'implicit declaration of function' warnings
Fix 'implicit declaration of function' warnings

c_src/yaws_sendfile_drv.c: In function 'set_error_buffer':
c_src/yaws_sendfile_drv.c:142:9: warning: implicit declaration of
                                          function 'tolower'
c_src/yaws_sendfile_drv.c: In function
                              'yaws_sendfile_drv_ready_output':
c_src/yaws_sendfile_drv.c:259:9: warning: implicit declaration of
                                          function 'close'

bsmr-erlang/yaws,namjae/yaws,patternmatched/yaws,watonyweng/yaws,toraritte/azith,zephyrean/yaws,namjae/yaws,andreineculau/yaws,imtal/yaws,toraritte/azith,klacke/yaws,zephyrean/yaws,weisslj/yaws,sebgod/yaws,toraritte/azith,klacke/yaws,patternmatched/yaws,namjae/yaws,imtal/yaws,leoliu/yaws,phonohawk/yaws,weisslj/yaws,leoliu/yaws,klacke/yaws,andreineculau/yaws,phonohawk/yaws,jgrinstead/yaws,treacheroustalks/yaws,weisslj/yaws,capflam/yaws,leoliu/yaws,toraritte/azith,ca91/yaws,sebgod/yaws,ca91/yaws,patternmatched/yaws,ca91/yaws,bsmr-erlang/yaws,klacke/yaws,treacheroustalks/yaws,namjae/yaws,watonyweng/yaws,namjae/yaws,patternmatched/yaws,jgrinstead/yaws,imtal/yaws,treacheroustalks/yaws,treacheroustalks/yaws,klacke/yaws,patternmatched/yaws,imtal/yaws,zephyrean/yaws,andreineculau/yaws,bsmr-erlang/yaws,watonyweng/yaws,weisslj/yaws,sebgod/yaws,jgrinstead/yaws,klacke/yaws,leoliu/yaws,klacke/yaws,weisslj/yaws,jgrinstead/yaws,sebgod/yaws,bsmr-erlang/yaws,watonyweng/yaws,imtal/yaws,bsmr-erlang/yaws,zephyrean/yaws,watonyweng/yaws,zephyrean/yaws,phonohawk/yaws,sebgod/yaws,andreineculau/yaws,jgrinstead/yaws,watonyweng/yaws,capflam/yaws,watonyweng/yaws,capflam/yaws,toraritte/azith,zephyrean/yaws,andreineculau/yaws,ca91/yaws,phonohawk/yaws,namjae/yaws,toraritte/azith,ca91/yaws,toraritte/azith,phonohawk/yaws,leoliu/yaws,sebgod/yaws,weisslj/yaws,ca91/yaws,phonohawk/yaws,capflam/yaws,imtal/yaws,bsmr-erlang/yaws,jgrinstead/yaws,capflam/yaws,capflam/yaws,leoliu/yaws,phonohawk/yaws,weisslj/yaws,patternmatched/yaws,zephyrean/yaws,ca91/yaws,sebgod/yaws,bsmr-erlang/yaws,capflam/yaws,leoliu/yaws,namjae/yaws,jgrinstead/yaws,patternmatched/yaws,imtal/yaws