fix bug in boinc::fscanf()

This was reading a line with fgets(),
then removing the last character from it
(usually but not necessarily a newline).
This is incorrect.
It broke the logic for checking .md5 files
(which look for the newline)

lib/boinc_stdio.h

@@ -183,7 +183,6 @@ namespace boinc {
     inline int fscanf(FILE *fp, const char *format, ...) {
         char buf[BUFSIZ];
         boinc::fgets(buf,BUFSIZ,fp);
-        buf[strlen(buf)-1]=0;
         va_list va;
         va_start(va, format);
         int i=::vsscanf(buf,format,va);