Install gperf through vcpkg on Windows.

build.html

@@ -249,7 +249,6 @@ function onOptionsChanged() {
     pre_text.push('Download and install <a href="https://visualstudio.microsoft.com/ru/vs/community/">Microsoft Visual Studio</a>. Enable C++ support while installing.');
     pre_text.push('Download and install <a href="https://cmake.org/download/">CMake</a>; choose "Add CMake to the system PATH" option while installing.');
     pre_text.push('Download and install <a href="https://git-scm.com/download/win">Git</a>.');
-    pre_text.push('Download and install <a href="https://sourceforge.net/projects/gnuwin32/files/gperf/3.0.1/">gperf</a>. Add the path to gperf.exe to the PATH environment variable.');
   }
   if (os_linux && linux_distro === 'Other') {
     var compiler = use_clang ? 'clang >= 3.4' : 'g++ >= 4.9.2';
@@ -410,9 +409,9 @@ function onOptionsChanged() {
     commands.push('cd vcpkg');
     commands.push(local + 'bootstrap-vcpkg.bat');
     if (build_64bit) {
-      commands.push(local + 'vcpkg.exe install openssl:x64-windows zlib:x64-windows');
+      commands.push(local + 'vcpkg.exe install gperf openssl:x64-windows zlib:x64-windows');
     } else {
-      commands.push(local + 'vcpkg.exe install openssl:x86-windows zlib:x86-windows');
+      commands.push(local + 'vcpkg.exe install gperf openssl:x86-windows zlib:x86-windows');
     }
     commands.push('cd ..');
   }