Trying to fix the WIndows build

Author: spacekookie

appveyor.yml

@@ -18,6 +18,16 @@ install:
         $Env:PATH += ';C:\msys64\mingw32\bin'
       }
   - curl -sSf -o rustup-init.exe https://win.rustup.rs/
+  - "sh -lc \"pacman -S --noconfirm --needed
+      mingw-w64-x86_64-openblas
+      mingw-w64-x86_64-arpack
+      mingw-w64-x86_64-gcc
+      mingw-w64-x86_64-gcc-fortran
+      mingw-w64-x86_64-ncurses
+      mingw-w64-x86_64-readline
+      mingw-w64-x86_64-python2-numpy
+      diffutils
+    \""
   - rustup-init.exe -y --default-host %TARGET% --default-toolchain %RUST_VERSION%
   - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
   - rustc -Vv