[ci,primitives] enable NEON on iOS builds

[akallabeth]

• Enable WITH_NEON=ON for iOS builds
• Fix a undeclared variable issue with NEON builds

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[freerdp-bot]

Refer to this link for build results (access rights to CI server needed):
https://ci.freerdp.com//job/PullRequestTester/11613/

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[freerdp-bot]

Refer to this link for build results (access rights to CI server needed):
https://ci.freerdp.com//job/PullRequestTester/11614/

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[freerdp-bot]

Refer to this link for build results (access rights to CI server needed):
https://ci.freerdp.com//job/PullRequestTester/11615/

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[freerdp-bot]

Refer to this link for build results (access rights to CI server needed):
https://ci.freerdp.com//job/PullRequestTester/11616/

[VVD]

Thanks for so fast fix!

Just for information: reported via IRC.
Found by pkg-fallout:
https://pkg-status.freebsd.org/ampere3/data/132arm64-default/74acf3311b89/logs/freerdp3-3.3.0.log
https://pkg-status.freebsd.org/ampere3/data/140arm64-default/74acf3311b89/logs/freerdp3-3.3.0.log

Fixed in FreeBSD ports:
https://cgit.freebsd.org/ports/commit/?id=39ab02e0f6b47be3a2e1cf19cc3d9c45e02d2ab0
freebsd/freebsd-ports@39ab02e