Fix Windows build: use mode='wb' and fix cache dir for 64-bit R

R 4.2+ on Windows has empty R_ARCH (not /x64), so use MECAB_ARCH for
the cache directory. Also add mode='wb' to download.file for proper
binary transfer on Windows.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 2 people

src/Makevars.win

@@ -36,9 +36,9 @@ all: libmecab $(SHLIB)
 ## the opening '@' ensures operations are executed 'quietly'
 ## in order to see commands as they happens add a 'v' to the tar and cp commands
 libmecab:
-	@if [ ! -d ../mecab/win$(R_ARCH) ]; then mkdir -p ../mecab/win$(R_ARCH); fi
-	@if [ ! -f ../mecab/win$(R_ARCH)/mecab$(MECAB_ARCH)_$(MECAB_LANG).tar.gz ]; then `"$(R_HOME)/bin$(R_ARCH_BIN)/Rscript.exe" -e "download.file(url='https://github.com/junhewk/RcppMeCab/releases/download/0.0.1.0/mecab$(MECAB_ARCH)_$(MECAB_LANG).tar.gz', destfile='../mecab/win$(R_ARCH)/mecab$(MECAB_ARCH)_$(MECAB_LANG).tar.gz', quiet=TRUE)"`; fi
-	@tar xfz ../mecab/win$(R_ARCH)/mecab$(MECAB_ARCH)_$(MECAB_LANG).tar.gz
+	@if [ ! -d ../mecab/win$(MECAB_ARCH) ]; then mkdir -p ../mecab/win$(MECAB_ARCH); fi
+	@if [ ! -f ../mecab/win$(MECAB_ARCH)/mecab$(MECAB_ARCH)_$(MECAB_LANG).tar.gz ]; then `"$(R_HOME)/bin$(R_ARCH_BIN)/Rscript.exe" -e "download.file(url='https://github.com/junhewk/RcppMeCab/releases/download/0.0.1.0/mecab$(MECAB_ARCH)_$(MECAB_LANG).tar.gz', destfile='../mecab/win$(MECAB_ARCH)/mecab$(MECAB_ARCH)_$(MECAB_LANG).tar.gz', mode='wb', quiet=TRUE)"`; fi
+	@tar xfz ../mecab/win$(MECAB_ARCH)/mecab$(MECAB_ARCH)_$(MECAB_LANG).tar.gz
 	@if [ ! -d ../inst/libs$(R_ARCH) ]; then mkdir -p ../inst/libs$(R_ARCH); fi
 	@cp libmecab$(SHLIB_EXT) ../inst/libs$(R_ARCH)
 	@rm libmecab$(SHLIB_EXT)