build: fix stdint/inttypes detection with non-autotools

Fix `stdint.h` and `inttypes.h` detection with non-autotools builds on
Windows. (autotools already auto-detected them accurately.)

`lib/config-win32.h` builds (e.g. `Makefile.mk`):
- set `HAVE_STDINT_H` where supported.
- set `HAVE_INTTYPES_H` for MinGW.

CMake:
- auto-detect them on Windows. (They were both force-disabled.)
- delete unused `CURL_PULL_STDINT_H`.
- delete unused `CURL_PULL_INTTYPES_H`.
- stop detecting `HAVE_STDINT_H` twice.
  Present since the initial CMake commit: 4c5307b456

curl doesn't use these C99 headers, we need them now to workaround
broken wolfSSL builds. Ref: #10739

Once that clears up, we can delete these detections and macros (unless
we want to keep them for future us.)

Reviewed-by: Daniel Stenberg
Closes #10745

lib/config-win32.h

@@ -39,10 +39,18 @@
 #define HAVE_FCNTL_H 1
 
 /* Define to 1 if you have the <inttypes.h> header file. */
-#if defined(_MSC_VER) && (_MSC_VER >= 1800)
+#if defined(__MINGW32__) || \
+    (defined(_MSC_VER) && (_MSC_VER >= 1800))
 #define HAVE_INTTYPES_H 1
 #endif
 
+/* Define to 1 if you have the <stdint.h> header file. */
+#if defined(__MINGW32__) || defined(__POCC__) || \
+    (defined(_MSC_VER) && (_MSC_VER >= 1600)) || \
+    (defined(__BORLANDC__) && (__BORLANDC__ >= 0x0582))
+#define HAVE_STDINT_H 1
+#endif
+
 /* Define if you have the <io.h> header file. */
 #define HAVE_IO_H 1