mojoshader: questing autopkgtest failures

[Simon Chopin]

The autopkgtests have been failing on questing with the follwing error:

 /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:666:6: error: conflicting types for ‘FindRulePrecedences’; have ‘void(struct lemon *)’
663s 666 | void FindRulePrecedences(struct lemon *xp)
663s | ^~~~~~~~~~~~~~~~~~~
663s /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:84:6: note: previous declaration of ‘FindRulePrecedences’ with type ‘void(void)’
663s 84 | void FindRulePrecedences();
663s | ^~~~~~~~~~~~~~~~~~~
663s /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:695:6: error: conflicting types for ‘FindFirstSets’; have ‘void(struct lemon *)’
663s 695 | void FindFirstSets(struct lemon *lemp)
663s | ^~~~~~~~~~~~~
663s /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:85:6: note: previous declaration of ‘FindFirstSets’ with type ‘void(void)’
663s 85 | void FindFirstSets();
663s | ^~~~~~~~~~~~~
663s /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:757:6: error: conflicting types for ‘FindStates’; have ‘void(struct lemon *)’
663s 757 | void FindStates(struct lemon *lemp)
663s | ^~~~~~~~~~
663s /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:86:6: note: previous declaration of ‘FindStates’ with type ‘void(void)’
663s 86 | void FindStates();
663s | ^~~~~~~~~~
663s /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:929:6: error: conflicting types for ‘FindLinks’; have ‘void(struct lemon *)’
663s 929 | void FindLinks(struct lemon *lemp)
663s | ^~~~~~~~~
663s /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:87:6: note: previous declaration of ‘FindLinks’ with type ‘void(void)’
663s 87 | void FindLinks();
663s | ^~~~~~~~~
663s /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:964:6: error: conflicting types for ‘FindFollowSets’; have ‘void(struct lemon *)’
663s 964 | void FindFollowSets(struct lemon *lemp)
663s | ^~~~~~~~~~~~~~
663s /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:88:6: note: previous declaration of ‘FindFollowSets’ with type ‘void(void)’
663s 88 | void FindFollowSets();
663s | ^~~~~~~~~~~~~~
663s /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:1000:6: error: conflicting types for ‘FindActions’; have ‘void(struct lemon *)’
663s 1000 | void FindActions(struct lemon *lemp)
663s | ^~~~~~~~~~~
663s /tmp/autopkgtest.8u1kLo/build.ala/src/misc/lemon.c:89:6: note: previous declaration of ‘FindActions’ with type ‘void(void)’
663s 89 | void FindActions();
663s | ^~~~~~~~~~~

Full logs at https://objectstorage.prodstack5.canonical.com/swift/v1/AUTH_0f9aae918d5b4744bf7b827671c86842/autopkgtest-questing/questing/armhf/m/mojoshader/20250818_110355_3cdf5@/log.gz#S4

Most likely a GCC 15 issue.