windows.cfg: deprecate '_alloca()'. Ref. https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/alloca?view=msvc-170

cfg/windows.cfg

@@ -5369,8 +5369,7 @@ HFONT CreateFont(
       <not-bool/>
     </arg>
   </function>
-  <!--void *_malloca(
-  size_t size);-->
+  <!--void *_malloca(size_t size);-->
   <function name="_malloca">
     <returnValue type="void *"/>
     <use-retval/>
@@ -5380,8 +5379,7 @@ HFONT CreateFont(
       <valid>0:</valid>
     </arg>
   </function>
-  <!--void *_alloca(
-  size_t size);-->
+  <!--void *_alloca(size_t size);-->
   <function name="_alloca">
     <returnValue type="void *"/>
     <noreturn>false</noreturn>
@@ -5390,9 +5388,9 @@ HFONT CreateFont(
       <not-uninit/>
       <valid>0:</valid>
     </arg>
+    <warn severity="style" alternatives="_malloca">This function is deprecated because a more secure version is available '_malloca'.</warn>
   </function>
-  <!--void _freea(
-  void *memblock);-->
+  <!--void _freea(void *memblock);-->
   <function name="_freea">
     <noreturn>false</noreturn>
     <returnValue type="void"/>

test/cfg/windows.cpp

@@ -260,6 +260,7 @@ void validCode()
     void *pMem1 = _malloca(1);
     _freea(pMem1);
     // Memory from _alloca must not be freed
+    // cppcheck-suppress _allocaCalled
     void *pMem2 = _alloca(10);
     memset(pMem2, 0, 10);
 
@@ -683,6 +684,7 @@ void ignoredReturnValue()
     // cppcheck-suppress leakReturnValNotUsed
     _malloca(10);
     // cppcheck-suppress ignoredReturnValue
+    // cppcheck-suppress _allocaCalled
     _alloca(5);
 
     // cppcheck-suppress ignoredReturnValue
@@ -745,6 +747,7 @@ void invalidFunctionArg()
     _freea(pMem);
     // FIXME cppcheck-suppress unreadVariable
     // cppcheck-suppress invalidFunctionArg
+    // cppcheck-suppress _allocaCalled
     pMem = _alloca(-5);
 }