databases/mysql56-client: be ready for OpenSSL 3.0 in base

Use same approach as in f89fd0980a
for mysql57-client. PORTREVISION not bumped intentionally.

PR:		271656

databases/mysql56-client/files/patch-cmake_ssl.cmake

@@ -1,8 +1,36 @@
---- cmake/ssl.cmake.orig	2019-11-26 16:53:45 UTC
-+++ cmake/ssl.cmake
-@@ -189,13 +189,20 @@ MACRO (MYSQL_CHECK_SSL)
+--- cmake/ssl.cmake.orig	2021-01-05 17:19:59.000000000 +0700
++++ cmake/ssl.cmake	2023-06-13 13:07:00.168639000 +0700
+@@ -169,6 +169,25 @@ MACRO (MYSQL_CHECK_SSL)
+     ENDIF()
+ 
+     IF(OPENSSL_INCLUDE_DIR)
++     FOREACH(version_part
++        OPENSSL_VERSION_MAJOR
++        OPENSSL_VERSION_MINOR
++        OPENSSL_VERSION_PATCH
++     )
++        FILE(STRINGS "${OPENSSL_INCLUDE_DIR}/openssl/opensslv.h" ${version_part}
++        REGEX "^#[\t ]*define[\t ]+${version_part}[\t ]+([0-9]+).*")
++        STRING(REGEX REPLACE
++          "^.*${version_part}[\t ]+([0-9]+).*" "\\1"
++          ${version_part} "${${version_part}}")
++     ENDFOREACH()
++
++     IF(OPENSSL_VERSION_MAJOR VERSION_EQUAL 3)
++      # OpenSSL 3
++        SET(OPENSSL_MAJOR_VERSION "${OPENSSL_VERSION_MAJOR}")
++        SET(OPENSSL_MINOR_VERSION "${OPENSSL_VERSION_MINOR}")
++        SET(OPENSSL_FIX_VERSION "${OPENSSL_VERSION_PATCH}")
++        SET(OPENSSL_FOUND TRUE)
++     ELSE()
+       # Verify version number. Version information looks like:
+       #   #define OPENSSL_VERSION_NUMBER 0x1000103fL
+       # Encoded as MNNFFPPS: major minor fix patch status
+@@ -188,14 +207,22 @@ MACRO (MYSQL_CHECK_SSL)
+         "^.*OPENSSL_VERSION_NUMBER[\t ]+0x[0-9][0-9][0-9]([0-9][0-9]).*$" "\\1"
          OPENSSL_FIX_VERSION "${OPENSSL_VERSION_NUMBER}"
          )
++     ENDIF()
      ENDIF()
 -    IF("${OPENSSL_MAJOR_VERSION}.${OPENSSL_MINOR_VERSION}.${OPENSSL_FIX_VERSION}" VERSION_GREATER "1.1.0")
 -       ADD_DEFINITIONS(-DHAVE_TLSv13)