Fix regression.
Fix regression.

#1377 removed the #include <stdbool.h> line from types.h but 7517bbdf8778c37fa494966b39623dc6c2ccfce9 added it back.

VirusTotal/yara,cblichmann/yara,pombredanne/yara,VirusTotal/yara,hillu/yara,wxsBSD/yara,cblichmann/yara,wxsBSD/yara,cblichmann/yara,pombredanne/yara,VirusTotal/yara,pombredanne/yara,VirusTotal/yara,hillu/yara,pombredanne/yara,cblichmann/yara,hillu/yara,hillu/yara,cblichmann/yara,VirusTotal/yara,hillu/yara,pombredanne/yara,wxsBSD/yara,wxsBSD/yara,wxsBSD/yara