Reinstate downloading of busybox-w32 in make win-extras

We may want to make this conditional on USE_GPL_LIBS, though since
we're only running it as a command line executable and not linking
to it, it probably falls under the aggregation clause

LICENSE.md

@@ -81,6 +81,7 @@ Julia's build process uses the following external tools:
 Julia bundles the following external programs and libraries on some platforms:
 
 - [7-Zip](https://www.7-zip.org/license.txt)
+- [BUSYBOX](https://github.com/rmyorston/busybox-w32/blob/master/LICENSE)
 - [ZLIB](https://zlib.net/zlib_license.html)
 - [LIBEXPAT](https://expat.cvs.sourceforge.net/viewvc/expat/expat/README)
 - [OPENSSL](https://github.com/openssl/openssl/blob/master/LICENSE)

Makefile

@@ -462,7 +462,7 @@ endif
 
 ifeq ($(OS), WINNT)
  [ ! -d $(JULIAHOME)/dist-extras ] || ( cd $(JULIAHOME)/dist-extras && \
- cp 7z.exe 7z.dll libexpat-1.dll zlib1.dll libgfortran-3.dll libquadmath-0.dll libstdc++-6.dll libgcc_s_s*-1.dll libssp-0.dll $(BUILDROOT)/julia-$(JULIA_COMMIT)/bin )
+ cp 7z.exe 7z.dll busybox.exe libexpat-1.dll zlib1.dll libgfortran-3.dll libquadmath-0.dll libstdc++-6.dll libgcc_s_s*-1.dll libssp-0.dll $(BUILDROOT)/julia-$(JULIA_COMMIT)/bin )
  cd $(BUILDROOT)/julia-$(JULIA_COMMIT)/bin && rm -f llvm* llc.exe lli.exe opt.exe LTO.dll bugpoint.exe macho-dump.exe
 
  # create file listing for uninstall. note: must have Windows path separators and line endings.
@@ -618,10 +618,12 @@ endif
  cd $(JULIAHOME)/dist-extras && \
  $(JLDOWNLOAD) https://downloads.sourceforge.net/sevenzip/7z920_extra.7z && \
  $(JLDOWNLOAD) https://unsis.googlecode.com/files/nsis-2.46.5-Unicode-setup.exe && \
+ $(JLDOWNLOAD) busybox.exe https://frippery.org/files/busybox/busybox-w32-FRP-483-g31277ab.exe && \
  chmod a+x 7z.exe && \
  chmod a+x 7z.dll && \
  $(call spawn,./7z.exe) x -y -onsis nsis-2.46.5-Unicode-setup.exe && \
- chmod a+x ./nsis/makensis.exe
+ chmod a+x ./nsis/makensis.exe && \
+ chmod a+x busybox.exe
 
 # various statistics about the build that may interest the user
 ifeq ($(USE_SYSTEM_LLVM), 1)

appveyor.yml

@@ -35,6 +35,7 @@ cache:
  - x86_64-4.9.2-release-win32-seh-rt_v4-rev3.7z
  - llvm-3.7.1-i686-w64-mingw32-juliadeps-r09.7z
  - llvm-3.7.1-x86_64-w64-mingw32-juliadeps-r09.7z
+ - usr/bin/busybox.exe
 
 build_script:
 # If there's a newer build queued for the same PR, cancel this one

contrib/windows/msys_build.sh

@@ -156,6 +156,10 @@ if [ -z "`which make 2>/dev/null`" ]; then
  export PATH=$PWD/bin:$PATH
 fi
 
+f=busybox-w32-FRP-483-g31277ab.exe
+echo "Downloading $f"
+$curlflags -o usr/bin/busybox.exe https://frippery.org/files/busybox/$f
+
 for lib in SUITESPARSE ARPACK BLAS LAPACK FFTW \
  GMP MPFR PCRE LIBUNWIND OPENSPECFUN; do
  echo "USE_SYSTEM_$lib = 1" >> Make.user