Windows install notes

INSTALL.W32.md

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+# osslsigncode Windows install notes
+
+### Building osslsigncode source with MSYS2 MinGW 64-bit and MSYS2 packages:
+
+1) Download and install MSYS2 from https://msys2.github.io/ and follow installation instructions.
+   Once up and running install even mingw-w64-x86_64-gcc, mingw-w64-x86_64-curl, mingw-w64-x86_64-libgsf.
+```
+  pacman -S mingw-w64-x86_64-gcc mingw-w64-x86_64-curl mingw-w64-x86_64-libgsf
+```
+   mingw-w64-x86_64-openssl and mingw-w64-x86_64-zlib packages are installed with dependencies.
+
+2) Run "MSYS2 MinGW 64-bit" and build 64-bit Windows executables.
+```
+  cd osslsigncode-folder
+  x86_64-w64-mingw32-gcc osslsigncode.c  -o osslsigncode.exe \
+    -lcrypto -lssl -lcurl -lgsf-1 -lgobject-2.0 -lglib-2.0 -lxml2 \
+    -I 'C:/msys64/mingw64/include/libgsf-1' \
+    -I 'C:/msys64/mingw64/include/glib-2.0' \
+    -I 'C:/msys64/mingw64/lib/glib-2.0/include' \
+    -D 'PACKAGE_STRING="osslsigncode 2.1.0"' \
+    -D 'PACKAGE_BUGREPORT="Michal.Trojnara@stunnel.org"' \
+    -D ENABLE_CURL \
+    -D WITH_GSF
+```
+
+3) Run "Command prompt" and include "c:\msys64\mingw64\bin" folder as part of the path.
+```
+  path=%path%;c:\msys64\mingw64\bin
+  cd osslsigncode-folder
+
+  osslsigncode.exe -v
+  osslsigncode 2.1.0, using:
+           OpenSSL 1.1.1g  21 Apr 2020
+           libcurl/7.70.0 OpenSSL/1.1.1g (Schannel) zlib/1.2.11 brotli/1.0.7 libidn2/2.3.0
+           libpsl/0.21.0 (+libidn2/2.3.0) libssh2/1.9.0 nghttp2/1.40.0 libgsf 1.14.46
+```
+
+
+### Building OpenSSL, Curl and osslsigncode sources with MSYS2 MinGW 64-bit:
+
+1) Download and install MSYS2 from https://msys2.github.io/ and follow installation instructions.
+   Once up and running install even: perl make autoconf automake libtool pkg-config.
+```
+  pacman -S perl make autoconf automake libtool pkg-config
+```
+   Make sure there are no curl, brotli, libpsl, libidn2 and nghttp2 packages installed:
+```
+  pacman -R mingw-w64-x86_64-curl \
+    mingw-w64-x86_64-brotli \
+    mingw-w64-x86_64-libpsl \
+    mingw-w64-x86_64-libidn2 \
+    mingw-w64-x86_64-nghttp2
+```
+
+   Run "MSYS2 MinGW 64-bit" in the administrator mode.
+
+2) Build and install OpenSSL.
+```
+  cd openssl-(version)
+  ./config --prefix='C:/OpenSSL' --openssldir='C:/OpenSSL'
+  make && make install
+```
+ 3) Build and install curl.
+```
+  cd curl-(version)
+  ./buildconf
+  ./configure --prefix='C:/curl' --with-ssl='C:/OpenSSL' \
+    --disable-ftp --disable-tftp --disable-file --disable-dict \
+    --disable-telnet --disable-imap --disable-smb --disable-smtp \
+    --disable-gopher --disable-pop --disable-pop3 --disable-rtsp \
+    --disable-ldap --disable-ldaps --disable-unix-sockets --disable-pthreads
+  make && make install
+```
+
+3) Build 64-bit Windows executables.
+```
+  cd osslsigncode-folder
+  x86_64-w64-mingw32-gcc osslsigncode.c -o osslsigncode.exe \
+    -L 'C:/OpenSSL/lib/' -lcrypto -lssl \
+    -I 'C:/OpenSSL/include/' \
+    -L 'C:/curl/lib' -lcurl \
+    -I 'C:/curl/include' \
+    -D 'PACKAGE_STRING="osslsigncode 2.1.0"' \
+    -D 'PACKAGE_BUGREPORT="Michal.Trojnara@stunnel.org"' \
+    -D ENABLE_CURL
+```
+
+4) Run "Command prompt" and copy required libraries.
+```
+  cd osslsigncode-folder
+  copy C:\OpenSSL\bin\libssl-1_1-x64.dll
+  copy C:\OpenSSL\bin\libcrypto-1_1-x64.dll
+  copy C:\curl\bin\libcurl-4.dll
+  copy C:\msys64\mingw64\bin\zlib1.dll
+
+  osslsigncode.exe -v
+  osslsigncode 2.1.0, using:
+          OpenSSL 1.1.1g  21 Apr 2020
+          libcurl/7.70.0 OpenSSL/1.1.1g zlib/1.2.11
+          no libgsf available
+```