Fix #13599 Bad configuration for std::clamp (danmar#7273)

Author: chrchr-github

cfg/std.cfg

@@ -6374,7 +6374,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   <!-- template< class T >                constexpr const T& std::clamp( const T& v, const T& lo, const T& hi);                (since C++17) -->
   <!-- template< class T, class Compare > constexpr const T& std::clamp( const T& v, const T& lo, const T& hi, Compare comp ); (since C++17) -->
   <!-- https://en.cppreference.com/w/cpp/algorithm/clamp -->
-  <function name="clamp,std::clamp">
+  <function name="std::clamp">
     <use-retval/>
     <noreturn>false</noreturn>
     <leak-ignore/>
@@ -6394,7 +6394,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
     </arg>
   </function>
   <!-- template <class T> const T& min(const T& a, const T& b); -->
-  <function name="min,std::min">
+  <function name="std::min">
     <use-retval/>
     <noreturn>false</noreturn>
     <leak-ignore/>
@@ -6408,7 +6408,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
     </arg>
   </function>
   <!-- template <class T> const T& max(const T& a, const T& b); -->
-  <function name="max,std::max">
+  <function name="std::max">
     <use-retval/>
     <noreturn>false</noreturn>
     <leak-ignore/>

test/cfg/std.c

@@ -4897,6 +4897,11 @@ void ignoredReturnValue_abs(int i)
     abs(-100);
 }
 
+int clamp(int, int, int, int); // #13599
+void ignoredReturnValue_clamp(int a, int b, int c, int d) {
+    clamp(a, b, c, d); // not a library function
+}
+
 void nullPointer_asctime(void)
 {
     const struct tm *tm = 0;