Import of CCTZ from GitHub.

PiperOrigin-RevId: 838869622
Change-Id: I92047cd4e3ca51afded452316332bded5dc79a3f

absl/time/internal/cctz/src/time_zone_format.cc

diff --git a/absl/time/internal/cctz/src/time_zone_format.cc b/absl/time/internal/cctz/src/time_zone_format.cc
index 2beac8e..5b80c80 100644
--- a/absl/time/internal/cctz/src/time_zone_format.cc
+++ b/absl/time/internal/cctz/src/time_zone_format.cc
@@ -13,12 +13,14 @@
 //   limitations under the License.
 
 #if !defined(HAS_STRPTIME)
-#if !defined(_MSC_VER) && !defined(__MINGW32__) && !defined(__VXWORKS__)
+#if defined(_MSC_VER) || defined(__MINGW32__) || defined(__VXWORKS__)
+#define HAS_STRPTIME 0
+#else
 #define HAS_STRPTIME 1  // Assume everyone else has strptime().
 #endif
 #endif
 
-#if defined(HAS_STRPTIME) && HAS_STRPTIME
+#if HAS_STRPTIME
 #if !defined(_XOPEN_SOURCE) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
 #define _XOPEN_SOURCE 500  // Exposes definitions for SUSv2 (UNIX 98).
 #endif
@@ -40,7 +42,7 @@
 #include <limits>
 #include <string>
 #include <vector>
-#if !defined(HAS_STRPTIME)
+#if !HAS_STRPTIME
 #include <iomanip>
 #include <sstream>
 #endif
@@ -56,7 +58,7 @@
 
 namespace {
 
-#if !defined(HAS_STRPTIME)
+#if !HAS_STRPTIME
 // Build a strptime() using C++11's std::get_time().
 char* strptime(const char* s, const char* fmt, std::tm* tm) {
   std::istringstream input(s);