gh-119853: Add Include/refcount.h to projects (#119860)

Author: vstinner

Makefile.pre.in

@@ -1055,6 +1055,7 @@ PYTHON_HEADERS= \
 		$(srcdir)/Include/pythread.h \
 		$(srcdir)/Include/pytypedefs.h \
 		$(srcdir)/Include/rangeobject.h \
+		$(srcdir)/Include/refcount.h \
 		$(srcdir)/Include/setobject.h \
 		$(srcdir)/Include/sliceobject.h \
 		$(srcdir)/Include/structmember.h \

PCbuild/pythoncore.vcxproj

@@ -349,6 +349,7 @@
     <ClInclude Include="..\Include\pythread.h" />
     <ClInclude Include="..\Include\pytypedefs.h" />
     <ClInclude Include="..\Include\rangeobject.h" />
+    <ClInclude Include="..\Include\refcount.h" />
     <ClInclude Include="..\Include\setobject.h" />
     <ClInclude Include="..\Include\sliceobject.h" />
     <ClInclude Include="..\Include\structmember.h" />

PCbuild/pythoncore.vcxproj.filters

@@ -207,6 +207,9 @@
     <ClInclude Include="..\Include\rangeobject.h">
       <Filter>Include</Filter>
     </ClInclude>
+    <ClInclude Include="..\Include\refcount.h">
+      <Filter>Include</Filter>
+    </ClInclude>
     <ClInclude Include="..\Include\setobject.h">
       <Filter>Include</Filter>
     </ClInclude>