Restore RWinLib

Author: lionel-

src/Makevars.win

@@ -0,0 +1,16 @@
+CXX_STD = CXX11
+
+RWINLIB = ../windows/baselibs-3.5.0
+
+PKG_CPPFLAGS = -I${RWINLIB}/include \
+	-DSTRICT_R_HEADERS
+
+PKG_LIBS = -L${RWINLIB}/lib${R_ARCH} -lpng -lz
+
+all: clean winlibs
+
+winlibs:
+	"${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" "../tools/winlibs.R" ${VERSION}
+
+clean:
+	rm -f $(OBJECTS)

tools/winlibs.R

@@ -0,0 +1,8 @@
+BASELIB <- "3.5.0"
+if(!file.exists(sprintf("../windows/baselibs-%s/include/png.h", BASELIB))){
+  if(getRversion() < "3.3.0") setInternet2()
+  download.file(sprintf("https://github.com/rwinlib/baselibs/archive/v%s.zip", BASELIB), "lib.zip", quiet = TRUE)
+  dir.create("../windows", showWarnings = FALSE)
+  unzip("lib.zip", exdir = "../windows")
+  unlink("lib.zip")
+}