What's new?

• updated configure and makefiles to improve SIMD (SSE2/AVX2/AVX512BW/NEON/AArch64) detection and cross-compilation
• removed unused m4/ax_check scripts, adding corresponding PKG_CHECK_MODULES to configure.ac instead
• update some of the ctype function calls to avoid potential signedness pitfalls
• AIX build #374
• use statfs() with options --include-fs and --exclude-fs when the preferred statvfs() is not available
• suppress --filter utility stderr messages when ugrep options -s (--no-messages) and -q (--quiet) are used #377
• fix Cygwin --filter utility hanging after fork when worker threads are active, by forcing single-threaded search (a bit crude, but Cygwin fork isn't identical to Unix fork)
• support the NO_COLOR environment variable to suppress color output
• fix TUI scroll glitch (cursor down to scroll screen content up) in non-split screen (glitch appeared when adding the split screen feature)
• TUI line selection mode top row number indicator added, for consistency
• TUI quit & output after line selection mode now behaves the same as non-TUI search output, for consistency
• faster -q (--quiet) search