win32: libproxy is not needed

cmake/modules/NSIS.template.in

@@ -441,7 +441,6 @@ Section "${APPLICATION_NAME}" SEC_APPLICATION
    File "${MING_BIN}\libGLESv2.dll"
    File "${MING_BIN}\libjpeg-8.dll"
    File "${MING_BIN}\libpcre16-0.dll"
-   File "${MING_BIN}\libproxy.dll"
    File "${MING_BIN}\libsqlite3-0.dll"
    File "${MING_BIN}\libcrypto-10.dll"
    File "${MING_BIN}\libssl-10.dll"