We couldn't use nmake before configure.bat

.github/workflows/windows.yml

@@ -142,7 +142,9 @@ jobs:
         run: cl
 
       - name: Install libraries with vcpkg
-        run: nmake install-vcpkg
+        run: |
+          vcpkg install --triplet x64-windows
+        working-directory: src
         env:
           VCPKG_BINARY_SOURCES: "clear;x-gha,readwrite"
 
@@ -161,6 +163,8 @@ jobs:
           ../src/win32/configure.bat --disable-install-doc
           --with-opt-dir=D:/a/ruby/ruby/src/vcpkg_installed/x64-windows
 
+      - run: nmake prepare-vcpkg
+
       - run: nmake incs
 
       - run: nmake extract-extlibs

win32/Makefile.sub

@@ -597,8 +597,10 @@ update-vcpkg::
 
 install-vcpkg::
 	@cd "$(srcdir:/=\)" && set LC_TIME=C && vcpkg install
-	for %%I in ($(srcdir:/=\)\vcpkg_installed\x64-windows\bin\*.dll) do (
-		if not %%~nI == readline mklink %%~nxI %%I
+
+prepare-vcpkg::
+	for %%I in ($(srcdir:/=\)\vcpkg_installed\x64-windows\bin\*.dll) do ( \
+		if not %%~nI == readline mklink %%~nxI %%I \
 	)
 
 .PHONY: reconfig