Use C++ linkage.

storage/innobase/handler/ha_innodb.cc

@@ -1051,7 +1051,6 @@ Normalizes a table name string. A normalized name consists of the
 database name catenated to '/' and table name. An example:
 test/mytable. On Windows normalization puts both the database name and the
 table name always to lower case if "set_lower_case" is set to TRUE. */
-extern "C" UNIV_INTERN
 void
 normalize_table_name_low(
 /*=====================*/

storage/innobase/include/ha_prototypes.h

@@ -630,7 +630,6 @@ Normalizes a table name string. A normalized name consists of the
 database name catenated to '/' and table name. An example:
 test/mytable. On Windows normalization puts both the database name and the
 table name always to lower case if "set_lower_case" is set to TRUE. */
-extern "C" UNIV_INTERN
 void
 normalize_table_name_low(
 /*=====================*/

storage/xtradb/handler/ha_innodb.cc

@@ -1284,7 +1284,6 @@ Normalizes a table name string. A normalized name consists of the
 database name catenated to '/' and table name. An example:
 test/mytable. On Windows normalization puts both the database name and the
 table name always to lower case if "set_lower_case" is set to TRUE. */
-extern "C" UNIV_INTERN
 void
 normalize_table_name_low(
 /*=====================*/
@@ -5107,7 +5106,6 @@ Normalizes a table name string. A normalized name consists of the
 database name catenated to '/' and table name. Example: test/mytable.
 On Windows normalization puts both the database name and the
 table name always to lower case if "set_lower_case" is set to TRUE. */
-extern "C" UNIV_INTERN
 void
 normalize_table_name_low(
 /*=====================*/

storage/xtradb/include/ha_prototypes.h

@@ -643,7 +643,6 @@ Normalizes a table name string. A normalized name consists of the
 database name catenated to '/' and table name. An example:
 test/mytable. On Windows normalization puts both the database name and the
 table name always to lower case if "set_lower_case" is set to TRUE. */
-extern "C" UNIV_INTERN
 void
 normalize_table_name_low(
 /*=====================*/