Fix if statement that triggers syntax error in CMake 3.20 and later.

Taken from upstream:
https://github.com/mariadb-corporation/mariadb-connector-c/commit/242cab8c

diff --git a/libmariadb/cmake/ConnectorName.cmake b/libmariadb/cmake/ConnectorName.cmake
--- a/libmariadb/cmake/ConnectorName.cmake
+++ b/libmariadb/cmake/ConnectorName.cmake
@@ -22,7 +22,7 @@ IF(CMAKE_SYSTEM_NAME MATCHES "Windows")
     SET(MACHINE_NAME "x64")
   ELSE()
     SET(MACHINE_NAME "32")
-  END()
+  ENDIF()
 ENDIF()
 
 SET(product_name "mysql-connector-c-${CPACK_PACKAGE_VERSION}-${PLATFORM_NAME}${CONCAT_SIGN}${MACHINE_NAME}")name='id' value='2d11361a972f2835eaeeadff8f5215d193edfb7a'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
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