[Developer] Keyboard_info merge incorrectly assumes sil_myanmar_mywinext has mobile keyboards

[mcdurdin]

Describe the bug

While https://github.com/keymanapp/keyboards/tree/master/release/sil/sil_myanmar_mywinext targets desktop + web, it does not currently target mobile devices. However, the .keyboard_info merge generates the following platformSupport object:

  "platformSupport": {
    "windows": "full",
    "macos": "full",
    "linux": "full",
    "desktopWeb": "full",
    "mobileWeb": "full",
    "android": "full",
    "ios": "full"
  }

To reproduce ./build.sh release/sil/sil_myanmar_mywinext in the keyboards repo root. The resulting release/sil/sil_myanmar_mywinext/build/sil_myanmar_mywinext.keyboard_info has the incorrect platformSupport.

Expected behavior The entries for mobileWeb, android, and ios should either be none or not present.

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Keyman Developer:

• Keyman Developer version: 11.0.1356.0

(That version should be updated to 12.0 now as well...)

[mcdurdin]

Depends on https://github.com/keymanapp/keyboards/issues/337; see comment in MergeKeyboardInfo.pas, around line 1064:

    // TODO: Don't add Android and iOS when we complete the addition of all .js keyboards
    // to packages in the repository (including legacy keyboards)