We have to namespace the regex functions to avoid duplicate symbol errors.
This also ensures that vi doesn't define the libc reg* functions with
mismatched signatures.
ld: error: duplicate symbol: regcomp
defined at sanitizer_common_interceptors.inc:7519 (/usr/src/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc:7519)
asan_interceptors.o:(__interceptor_regcomp) in archive /usr/lib/clang/10.0.1/lib/freebsd/libclang_rt.asan-x86_64.adefined at regcomp.c
.../regex/regcomp.c.o:(.text+0x0)
ld: error: duplicate symbol: regerror
defined at sanitizer_common_interceptors.inc:7543 (/usr/src/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc:7543)
asan_interceptors.o:(__interceptor_regerror) in archive /usr/lib/clang/10.0.1/lib/freebsd/libclang_rt.asan-x86_64.adefined at regerror.c
.../regex/regerror.c.o:(.text+0x0)
ld: error: duplicate symbol: regexec
defined at sanitizer_common_interceptors.inc:7530 (/usr/src/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc:7530)
asan_interceptors.o:(__interceptor_regexec) in archive /usr/lib/clang/10.0.1/lib/freebsd/libclang_rt.asan-x86_64.adefined at regexec.c
.../regex/regexec.c.o:(.text+0x0)
ld: error: duplicate symbol: regfree
defined at sanitizer_common_interceptors.inc:7553 (/usr/src/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc:7553)
asan_interceptors.o:(__interceptor_regfree) in archive /usr/lib/clang/10.0.1/lib/freebsd/libclang_rt.asan-x86_64.adefined at regfree.c
.../regex/regfree.c.o:(.text+0x0)
Submitted upstream as https://github.com/lichray/nvi2/pull/92