tests: stop overriding system printf symbols

To make the source code match the functions called at runtime.
And to avoid the preprocessor trick that may introduces build issues.

Before this patch, libtests, tunits and units were calling a mixture
of curl and system printf calls, then transformed them all to curl
printf calls by including `curl_printf.h`.

Changes made:
- tests: stop including `curl_printf.h`.
- libtest: switch a couple of outlier system printf calls to curl
  printf.
- unit: use more curl printf to avoid casts and show whole values.
- unit: switch remaining calls to curl printf explicitly.
- tunit: switch to call curl printf explicitly.
- libtest, tunit, unit: ban system printf.
- unit1307, unit1607, unit1609, unit1652, unit1655, unit3214: bump
  types/masks to avoid casts.

After this patch:
- libtests, tunits, units: use exclusively curl printf.
  (as before, but explicitly, without relying on redefinitions.)
- servers: is unchanged (it can only use system printf).

Closes #18814

tests/libtest/.checksrc

@@ -0,0 +1,8 @@
+banfunc aprintf
+banfunc fprintf
+banfunc msnprintf
+banfunc mvsnprintf
+banfunc printf
+banfunc vaprintf
+banfunc vfprintf
+banfunc vprintf

tests/libtest/Makefile.am

@@ -41,7 +41,7 @@ AM_CPPFLAGS = -I$(top_srcdir)/include        \
 # Get BUNDLE, FIRST_C, FIRST_H, UTILS_C, UTILS_H, CURLX_C, TESTS_C variables
 include Makefile.inc
 
-EXTRA_DIST = CMakeLists.txt $(FIRST_C) $(FIRST_H) $(UTILS_C) $(UTILS_H) $(TESTS_C) \
+EXTRA_DIST = CMakeLists.txt .checksrc $(FIRST_C) $(FIRST_H) $(UTILS_C) $(UTILS_H) $(TESTS_C) \
   test307.pl test610.pl test613.pl test1013.pl test1022.pl mk-lib1521.pl
 
 CFLAGS += @CURL_CFLAG_EXTRAS@

tests/libtest/first.h

@@ -52,8 +52,6 @@ extern int unitfail; /* for unittests */
 #include <sys/select.h>
 #endif
 
-#include "curl_printf.h"
-
 /* GCC <4.6 does not support '#pragma GCC diagnostic push' and
    does not support 'pragma GCC diagnostic' inside functions. */
 #if (defined(__GNUC__) && \

tests/libtest/lib1549.c

@@ -58,14 +58,14 @@ static CURLcode test_lib1549(const char *URL)
       /* a linked list of cookies in cookie file format */
       struct curl_slist *each = cookies;
       while(each) {
-        printf("%s\n", each->data);
+        curl_mprintf("%s\n", each->data);
         each = each->next;
         num++;
       }
       /* we must free these cookies when we are done */
       curl_slist_free_all(cookies);
     }
-    fprintf(stderr, "%d cookies\n", num);
+    curl_mfprintf(stderr, "%d cookies\n", num);
   }
 test_cleanup: