otherwise configure fails to find pcre2 when /bin/sh does not point to bash:
configure: using pcre v8.45
./configure: 16601: test: xno: unexpected operator
./configure: 16601: test: xno: unexpected operator
checking for libpcre2 config script... no
configure: *** pcre2 library not found.
configure: error: pcre2 library is required
Signed-off-by: Lars Wendler <polynomial-c@gmx.de>