build: globally define NOMINMAX on Windows in CMake

Author: abn

CMakeLists.txt

@@ -408,8 +408,8 @@ add_compile_definitions(CPPHTTPLIB_THREAD_POOL_COUNT=8)
 
 # Platform-specific compiler definitions
 if(WIN32)
-    # Set Windows target version to Windows 10 for httplib v0.26.0
-    add_compile_definitions(_WIN32_WINNT=0x0A00)
+    # Set Windows target version to Windows 10 for httplib v0.26.0, and prevent Windows.h min/max macro definitions
+    add_compile_definitions(_WIN32_WINNT=0x0A00 NOMINMAX)
     if(MSVC)
         # Add security-hardening compiler flags for MSVC
         # Control Flow Guard - prevents control flow hijacking