libcamera: Add IPA module signing infrastructure

Add infrastructure to generate an RSA private key and sign IPA modules.
The signatures are stored in separate files with a .sign suffix.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/meson.build

@@ -2,6 +2,11 @@ if get_option('android')
     subdir('android')
 endif
 
+ipa_gen_priv_key = find_program('ipa/gen-ipa-priv-key.sh')
+ipa_priv_key = custom_target('ipa-priv-key',
+                             output : [ 'ipa-priv-key.pem' ],
+                             command : [ ipa_gen_priv_key, '@OUTPUT@' ])
+
 subdir('libcamera')
 subdir('ipa')
 subdir('cam')