[master] 37040b4d8 mgt: Add an intentional conflict with pthread.h

[Dridi Boukelmoune]

commit 37040b4d83e865718a1ec1429c46d1f97bc9efbc
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Fri Jun 20 18:05:52 2025 +0200

    mgt: Add an intentional conflict with pthread.h
    
    If the macro check is not enough, this one hopefully catches stragglers.
    
    Suggestion from @asadsa92.
    
    Refs #4346

diff --git a/bin/varnishd/mgt/mgt.h b/bin/varnishd/mgt/mgt.h
index b99b96e22..146ed69a6 100644
--- a/bin/varnishd/mgt/mgt.h
+++ b/bin/varnishd/mgt/mgt.h
@@ -251,6 +251,13 @@ extern const char *mgt_vmod_path;
 #error "Keep pthreads out of the manager process"
 #endif
 
+static inline void
+pthread_create(void)
+{
+
+	WRONG("Intentional conflict with pthread.h");
+}
+
 #define MGT_FEATURE(x)		COM_FEATURE(mgt_param.feature_bits, x)
 #define MGT_EXPERIMENT(x)	COM_EXPERIMENT(mgt_param.experimental_bits, x)
 #define MGT_DO_DEBUG(x)		COM_DO_DEBUG(mgt_param.debug_bits, x)