MDEV-10293 'setupterm' was not declared in this scope

Check for readline before checking for curses headers, because
MYSQL_CHECK_READLINE fails when curses is not found, but
CHECK_INCLUDE_FILES simply remembers the fact and continues.  So if
there's no curses, MYSQL_CHECK_READLINE will abort, the user will then
installs curses and continue the build. Thus, CHECK_INCLUDE_HEADERS
will remember that there is no curses, but other checks from
MYSQL_CHECK_READLINE will remember that curses are there. It will
result in inconsistent HAVE_xxx defines.

cmake/readline.cmake

@@ -230,5 +230,6 @@ MACRO (MYSQL_CHECK_READLINE)
     SET(CMAKE_REQUIRED_LIBRARIES)
     SET(CMAKE_REQUIRED_INCLUDES)
   ENDIF(NOT WIN32)
+  CHECK_INCLUDE_FILES ("curses.h;term.h" HAVE_TERM_H)
 ENDMACRO()
 

configure.cmake

@@ -237,7 +237,6 @@ CHECK_INCLUDE_FILES (sys/socket.h HAVE_SYS_SOCKET_H)
 CHECK_INCLUDE_FILES (sys/stat.h HAVE_SYS_STAT_H)
 CHECK_INCLUDE_FILES (sys/stream.h HAVE_SYS_STREAM_H)
 CHECK_INCLUDE_FILES (sys/termcap.h HAVE_SYS_TERMCAP_H)
-CHECK_INCLUDE_FILES ("curses.h;term.h" HAVE_TERM_H)
 CHECK_INCLUDE_FILES (asm/termbits.h HAVE_ASM_TERMBITS_H)
 CHECK_INCLUDE_FILES (termbits.h HAVE_TERMBITS_H)
 CHECK_INCLUDE_FILES (termios.h HAVE_TERMIOS_H)