gnu: minizip-ng: Do not build in compatibility mode.

The pkg-config naming (and personality) of minizip-ng changes depending on
whether it's built with minizip-compatibility mode (enabled by default). Since
this package is named minizip-ng and not replacing the original minizip (yet),
preserve its own personality. 'minizip-ng.pc' is required by packages such as
emu-dolphin.

* gnu/packages/compression.scm (minizip-ng)
[#:configure-flags]: Add -DMZ_COMPAT=OFF.
(minizip-ng-compat): New variable.
* gnu/packages/emulators.scm (dolphin-emu) [inputs]: Replace minizip-ng with
minizip-ng-compat.

Change-Id: I71227035ef110162f72b9d0128b5c985c9cd58a5

gnu/packages/emulators.scm

@@ -513,7 +513,7 @@ It aims to support Nintendo DSi and 3DS as well.")
              mbedtls-lts
              mesa
              miniupnpc
-             minizip-ng
+             minizip-ng-compat
              openal
              pugixml
              pulseaudio