feat: list recalbox cores per board

Recalbox builds seven board images with different emulators. The new
target scraper reads each board's defconfig against the package every
system.ini core names. The names that reached no profile are mapped to
the projects Recalbox builds or profiled from their source, and the
mupen64plus video plugins are set aside.

platforms/targets/_overrides.yml

@@ -128,3 +128,27 @@ rocknix:
         - wine
     amd64:
       aliases: [x86_64, pc]
+
+recalbox:
+  targets:
+    _default:
+      # system.ini names a mupen64plus video plugin as the core of the
+      # mupen64plus emulator; mupenGenerator.py loads it with --gfx
+      # mupen64plus-video-<core>.so. Plugins, not emulators.
+      remove_cores:
+        - glide64mk2 # mupen64plus-video-glide64mk2
+        - gliden64 # GLideN64 video plugin
+        - n64_gles2 # mupen64plus-video-gles2n64
+        - rice # mupen64plus-video-rice
+        - rice_gles2 # mupen64plus-video-gles2rice
+    # Recalbox names its boards by defconfig (configs/recalbox-<board>_defconfig).
+    rpi3:
+      aliases: [rpi3b]
+    rpi4_64:
+      aliases: [rpi4, rpi400]
+    rpi5_64:
+      aliases: [rpi5]
+    rpizero2:
+      aliases: [rpi-zero2]
+    x86_64:
+      aliases: [pc]