MDEV-3927 Add variable "have yassl"

have_openssl variable was ON even when OpenSSL was not used (but YaSSL was).
fix that, so that have_openssl really corresponds to OpenSSL

rename not_openssl.inc to not_ssl.inc and fix the test accordingly.

mysql-test/include/not_openssl.inc

--- require r/not_openssl.require
-disable_query_log;
-show variables like "have_openssl";
-enable_query_log;

mysql-test/include/not_ssl.inc

+if (`select @@have_ssl = 'YES'`)
+{
+  skip only without SSL;
+}

mysql-test/r/not_openssl.require

-Variable_name	Value
-have_openssl	NO

mysql-test/t/func_encrypt_nossl.test

--- source include/not_openssl.inc
+-- source include/not_ssl.inc
 
 #
 # Test output from des_encrypt and des_decrypt when server is

sql/mysqld.cc

@@ -656,6 +656,7 @@ SHOW_COMP_OPTION have_ssl, have_symlink, have_dlopen, have_query_cache;
 SHOW_COMP_OPTION have_geometry, have_rtree_keys;
 SHOW_COMP_OPTION have_crypt, have_compress;
 SHOW_COMP_OPTION have_profiling;
+SHOW_COMP_OPTION have_openssl;
 
 /* Thread specific variables */
 
@@ -7366,8 +7367,13 @@ static int mysql_init_variables(void)
 
 #if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)
   have_ssl=SHOW_OPTION_YES;
+#if HAVE_YASSL
+  have_openssl= SHOW_OPTION_NO;
 #else
-  have_ssl=SHOW_OPTION_NO;
+  have_openssl= SHOW_OPTION_YES;
+#endif
+#else
+  have_openssl= have_ssl= SHOW_OPTION_NO;
 #endif
 #ifdef HAVE_BROKEN_REALPATH
   have_symlink=SHOW_OPTION_NO;

sql/set_var.h

@@ -297,6 +297,7 @@ extern SHOW_COMP_OPTION have_query_cache;
 extern SHOW_COMP_OPTION have_geometry, have_rtree_keys;
 extern SHOW_COMP_OPTION have_crypt;
 extern SHOW_COMP_OPTION have_compress;
+extern SHOW_COMP_OPTION have_openssl;
 
 /*
   Prototypes for helper functions

sql/sys_vars.cc

@@ -3074,7 +3074,7 @@ static Sys_var_have Sys_have_geometry(
 
 static Sys_var_have Sys_have_openssl(
        "have_openssl", "have_openssl",
-       READ_ONLY GLOBAL_VAR(have_ssl), NO_CMD_LINE);
+       READ_ONLY GLOBAL_VAR(have_openssl), NO_CMD_LINE);
 
 static Sys_var_have Sys_have_profiling(
        "have_profiling", "have_profiling",