devel/xtensa-esp32-elf: Fix build as non-root user (pkg-fallout)

[leres]

Summary

Proposed commit message:

Fix build as non-root user (BUILD_AS_NON_ROOT=yes in poudriere.conf)
reported by pkg-fallout. While we're at it turn off annoying
CT_LOG_PROGRESS_BAR spinner (which also makes the build log huge).

Reviewed by: ? (mentor)
Approved by: ? (mentor)
Differential Revision: ?

[matthew]

I can't reproduce whatever pkg-fallout was unhappy about.