bpo-35296: make install now installs the internal API (GH-10665) (GH-10897)

* bpo-35296: make install now installs the internal API (GH-10665)

make install now also installs the internal API: Include/internal/*.h
header files.

(cherry picked from commit f653fd4)

* Windows installer now also install Include/internal/

The Windows installer (MSI) now also install header files of the
Include/internal/ subdirectory.

Author: vstinner

Makefile.pre.in

@@ -1443,11 +1443,21 @@ inclinstall:
 		else	true; \
 		fi; \
 	done
+	@if test ! -d $(DESTDIR)$(INCLUDEPY)/internal; then \
+		echo "Creating directory $(DESTDIR)$(INCLUDEPY)/internal"; \
+		$(INSTALL) -d -m $(DIRMODE) $(DESTDIR)$(INCLUDEPY)/internal; \
+	else	true; \
+	fi
 	@for i in $(srcdir)/Include/*.h; \
 	do \
 		echo $(INSTALL_DATA) $$i $(INCLUDEPY); \
 		$(INSTALL_DATA) $$i $(DESTDIR)$(INCLUDEPY); \
 	done
+	@for i in $(srcdir)/Include/internal/*.h; \
+	do \
+		echo $(INSTALL_DATA) $$i $(INCLUDEPY)/internal; \
+		$(INSTALL_DATA) $$i $(DESTDIR)$(INCLUDEPY)/internal; \
+	done
 	$(INSTALL_DATA) pyconfig.h $(DESTDIR)$(CONFINCLUDEPY)/pyconfig.h
 
 # Install the library and miscellaneous stuff needed for extending/embedding

Misc/NEWS.d/next/Build/2018-12-04-17-10-17.bpo-35296.2ktH40.rst

@@ -0,0 +1,2 @@
+The Windows installer (MSI) now also install internal header files
+(``Include/internal/`` subdirectory).

Misc/NEWS.d/next/C API/2018-11-22-18-34-23.bpo-35296.nxrIQt.rst

@@ -0,0 +1,2 @@
+``make install`` now also installs the internal API:
+``Include/internal/*.h`` header files.

Tools/msi/dev/dev.wixproj

@@ -21,15 +21,15 @@
         <EmbeddedResource Include="*.wxl" />
     </ItemGroup>
     <ItemGroup>
-        <InstallFiles Include="$(PySourcePath)include\*.h">
+        <InstallFiles Include="$(PySourcePath)include\**\*.h">
             <SourceBase>$(PySourcePath)</SourceBase>
             <Source>!(bindpath.src)</Source>
             <TargetBase>$(PySourcePath)</TargetBase>
             <Target_></Target_>
             <Group>dev_include</Group>
         </InstallFiles>
     </ItemGroup>
-    
+
     <Target Name="BuildMinGWLib"
             Inputs="$(BuildPath)$(PyDllName).dll"
             Outputs="$(BuildPath)lib$(PyDllName).a"
@@ -46,4 +46,4 @@
     </Target>
 
     <Import Project="..\msi.targets" />
-</Project>
+</Project>