MDEV-4786 - merge 10.0-monty - 10.0

Fixed debian/ubuntu build failure.

cmake/ssl.cmake:
  Do not prefer static SSL libraries for WITH_SSL=system|yes as there is
  no guarantee that they will link well with MariaDB shared objects.
  Specifically on debian/ubuntu static SSL libraries are built without
  -fPIC.
  
  Restore 5.6 behavior. 10.0.3 never prefer static SSL libraries.

cmake/ssl.cmake

@@ -142,7 +142,9 @@ MACRO (MYSQL_CHECK_SSL)
 
     # On mac this list is <.dylib;.so;.a>
     # We prefer static libraries, so we revert it here.
-    LIST(REVERSE CMAKE_FIND_LIBRARY_SUFFIXES)
+    IF (WITH_SSL_PATH)
+      LIST(REVERSE CMAKE_FIND_LIBRARY_SUFFIXES)
+    ENDIF()
     MESSAGE(STATUS "suffixes <${CMAKE_FIND_LIBRARY_SUFFIXES}>")
     FIND_LIBRARY(OPENSSL_LIBRARIES
                  NAMES ssl ssleay32 ssleay32MD
@@ -150,7 +152,9 @@ MACRO (MYSQL_CHECK_SSL)
     FIND_LIBRARY(CRYPTO_LIBRARY
                  NAMES crypto libeay32
                  HINTS ${OPENSSL_ROOT_DIR}/lib)
-    LIST(REVERSE CMAKE_FIND_LIBRARY_SUFFIXES)
+    IF (WITH_SSL_PATH)
+      LIST(REVERSE CMAKE_FIND_LIBRARY_SUFFIXES)
+    ENDIF()
 
     # Verify version number. Version information looks like:
     #   #define OPENSSL_VERSION_NUMBER 0x1000103fL