Update minimum required CMake version to 3.5

[hyperupcall]

When building AppImageLauncher, I came across the error:

CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

The error shows when I use CMake v4.0.2, but not when I switch back to v3.31.7. Updating the minimum version to 3.5 fixed the issue for me.

• CMake 3.5.0 was announced on March 8, 2016
• CMake 3.2.0-rc1 was announced on February 13, 2015

I have also made a PR for AppImageUpdate.

[trinitronx]

I can verify that this also affects the ArchLinux aur/appimagelauncher-git package (version: r1329.3d42d4c-2)

$ yay -Syu --sudoloop

[...SNIP...]

==> Making package: appimagelauncher-git r1329.3d42d4c-2 (Fri 23 May 2025 02:27:48 PM MDT)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> WARNING: Using existing $srcdir/ tree
==> Starting pkgver()...
==> Starting build()...
CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.


-- Configuring incomplete, errors occurred!
==> ERROR: A failure occurred in build().
    Aborting...
 -> error making: appimagelauncher-git-exit status 4

cc: @FabioLolix

Note: This still depends on AppImageCommunity/AppImageUpdate@673af3cbe79f and needs this version be updated.

It will also need one more change to update CMake min version here

[TheAssassin]

Thanks!

[trinitronx]

Also seems CMake version needs to be updated in a few more sub-dependencies:

• lib/zlib: Bump minimum CMake version to 3.6 AppImageCommunity/zsync2#82
• args also needs CMake >= 3.6