Ensure VSC++ defines __cplusplus correctly, fix delete issue in alloc (#8552)

Author: mrotteveel

builds/win32/msvc15/FirebirdCommon.props

@@ -8,7 +8,7 @@
   </PropertyGroup>
   <ItemDefinitionGroup>
     <ClCompile>
-      <AdditionalOptions>/EHsc- %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions>/EHsc- /Zc:__cplusplus %(AdditionalOptions)</AdditionalOptions>
       <OmitFramePointers>true</OmitFramePointers>
       <AdditionalIncludeDirectories>../../../src/include;../../../src/include/gen;../../../extern/libtomcrypt/src/headers;../../../extern/libtommath;../../../extern/icu/include;../../../extern/zlib;../../../extern/re2;../../../extern/boost;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <ExceptionHandling>

src/common/classes/alloc.cpp

@@ -3034,3 +3034,15 @@ void operator delete[](void* mem) noexcept
 {
 	MemoryPool::globalFree(mem);
 }
+
+#if __cplusplus >= 201402L
+void operator delete(void* mem, std::size_t s) noexcept
+{
+	MemoryPool::globalFree(mem);
+}
+
+void operator delete[](void* mem, std::size_t s) noexcept
+{
+	MemoryPool::globalFree(mem);
+}
+#endif

src/common/classes/alloc.h

@@ -387,23 +387,16 @@ inline void operator delete[](void* mem, Firebird::MemoryPool& pool ALLOC_PARAMS
 	MemoryPool::globalFree(mem);
 }
 
-#if __cplusplus >= 201402L
-inline void operator delete(void* mem, std::size_t s ALLOC_PARAMS) noexcept
-{
-	MemoryPool::globalFree(mem);
-}
-
-inline void operator delete[](void* mem, std::size_t s ALLOC_PARAMS) noexcept
-{
-	MemoryPool::globalFree(mem);
-}
-#endif
-
 #ifdef DEBUG_GDS_ALLOC
 
 extern void operator delete(void* mem) noexcept;
 extern void operator delete[](void* mem) noexcept;
 
+#if __cplusplus >= 201402L
+extern void operator delete(void* mem, std::size_t s) noexcept;
+extern void operator delete[](void* mem, std::size_t s) noexcept;
+#endif
+
 #endif // DEBUG_GDS_ALLOC
 
 namespace Firebird