buildbot: {arch}=rhel-7-rpm-autobake needs pcre2-8 for 10.5+ builds

-- Looking for include files curses.h, term.h - found

-- Looking for pcre2_match_8 in pcre2-8

-- Looking for pcre2_match_8 in pcre2-8 - not found

CMake Error at cmake/pcre.cmake:83 (MESSAGE):

  system pcre2-8 library is not found or unusable

Call Stack (most recent call first):

  CMakeLists.txt:392 (CHECK_PCRE)

-- Configuring incomplete, errors occurred!