msvc: drop support for VS2005 and older

- cmake: assume large file support (VS2005+ / `_fseeki64()`)
- config-win32.h: assume large file support (VS2005+ / `_fseeki64()`)
- config-win32.h: assume `HAVE_LONGLONG` (VS2003+)
- config-win32.h: assume 64-bit `time_t` (VS2005+)
- config-win32.h: assume VS2008+
- cmake: use multi-threaded/parallel compilation (VS2008+)
- curl_setup.h: require multi-threading MSVC CRT (~VS2005+)
- curl_setup.h: hard fail for unsupported MSVC versions.
  Authored-by: Jay Satiro
- winbuild: bump minimum version

Follow-up to 308437ac53 #15992
Ref: #15972
Closes #16004

lib/config-win32.h

@@ -283,13 +283,12 @@
 /* #undef HAVE_GMTIME_R */
 
 /* Define if the compiler supports the 'long long' data type. */
-#if (defined(_MSC_VER) && (_MSC_VER >= 1310)) || defined(__MINGW32__)
+#if defined(_MSC_VER) || defined(__MINGW32__)
 #define HAVE_LONGLONG 1
 #endif
 
-/* mingw-w64 and visual studio >= 2005 (MSVCR80)
-   all default to 64-bit time_t unless _USE_32BIT_TIME_T is defined */
-#if (defined(_MSC_VER) && (_MSC_VER >= 1400)) || defined(__MINGW32__)
+/* Default to 64-bit time_t unless _USE_32BIT_TIME_T is defined */
+#if defined(_MSC_VER) || defined(__MINGW32__)
 #  ifndef _USE_32BIT_TIME_T
 #    define SIZEOF_TIME_T 8
 #  else
@@ -331,7 +330,7 @@
 #endif
 
 /* VS2008 default target settings and minimum build target check. */
-#if defined(_MSC_VER) && (_MSC_VER >= 1500) && (_MSC_VER <= 1600)
+#if defined(_MSC_VER) && (_MSC_VER <= 1600)
 #  ifndef _WIN32_WINNT
 #  define _WIN32_WINNT VS2008_DEF_TARGET
 #  endif
@@ -389,8 +388,7 @@ Vista
 
 #ifndef UNDER_CE
 
-/* _fseeki64() requires VS2005 */
-#if (defined(_MSC_VER) && (_MSC_VER >= 1400)) || defined(__MINGW32__)
+#if defined(_MSC_VER) || defined(__MINGW32__)
 #  define USE_WIN32_LARGE_FILES
 /* Number of bits in a file offset, on hosts where this is settable. */
 #  ifdef __MINGW32__

lib/curl_setup.h

@@ -78,6 +78,12 @@
 #endif
 #endif
 
+/* Visual Studio 2008 is the minimum Visual Studio version we support.
+   Workarounds for older versions of Visual Studio have been removed. */
+#if defined(_MSC_VER) && (_MSC_VER < 1500)
+#error "Ancient versions of Visual Studio are no longer supported due to bugs."
+#endif
+
 #ifdef _MSC_VER
 /* Disable Visual Studio warnings: 4127 "conditional expression is constant" */
 #pragma warning(disable:4127)
@@ -680,16 +686,6 @@
 /*         CURLRES_* defines to use in the host*.c sources          */
 /* ---------------------------------------------------------------- */
 
-/*
- * MSVC threads support requires a multi-threaded runtime library.
- * _beginthreadex() is not available in single-threaded ones.
- * Single-threaded option was last available in VS2005: _MSC_VER <= 1400
- */
-#if defined(_MSC_VER) && !defined(_MT)  /* available in _MSC_VER <= 1400 */
-#  undef USE_THREADS_POSIX
-#  undef USE_THREADS_WIN32
-#endif
-
 /*
  * Mutually exclusive CURLRES_* definitions.
  */