lib: strtoofft.h header cleanup

Drop the include from five C files, add it to one.

Closes #16331

lib/cf-h1-proxy.c

@@ -44,6 +44,7 @@
 #include "vtls/vtls.h"
 #include "transfer.h"
 #include "multiif.h"
+#include "strtoofft.h"
 
 /* The last 3 #include files should be in this order */
 #include "curl_printf.h"

lib/file.c

@@ -58,7 +58,6 @@
 #include <dirent.h>
 #endif
 
-#include "strtoofft.h"
 #include "urldata.h"
 #include <curl/curl.h>
 #include "progress.h"

lib/http2.c

@@ -43,7 +43,6 @@
 #include "cfilters.h"
 #include "connect.h"
 #include "rand.h"
-#include "strtoofft.h"
 #include "strdup.h"
 #include "transfer.h"
 #include "dynbuf.h"

lib/pop3.c

@@ -65,7 +65,6 @@
 #include "http.h" /* for HTTP proxy tunnel stuff */
 #include "socks.h"
 #include "pop3.h"
-#include "strtoofft.h"
 #include "strcase.h"
 #include "vtls/vtls.h"
 #include "cfilters.h"

lib/smtp.c

@@ -68,7 +68,6 @@
 #include "mime.h"
 #include "socks.h"
 #include "smtp.h"
-#include "strtoofft.h"
 #include "strcase.h"
 #include "vtls/vtls.h"
 #include "cfilters.h"

lib/transfer.c

@@ -23,7 +23,6 @@
  ***************************************************************************/
 
 #include "curl_setup.h"
-#include "strtoofft.h"
 
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>