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}")hod='get'>
<input type='hidden' name='id' value='fb6714d13f734e2ebea2ef7d42f57013dd124478'/><input type='hidden' name='showmsg' value='1'/><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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<div class='path'>path: <a href='/guix/log/?id=fb6714d13f734e2ebea2ef7d42f57013dd124478&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=fb6714d13f734e2ebea2ef7d42f57013dd124478&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/installer?id=fb6714d13f734e2ebea2ef7d42f57013dd124478&amp;showmsg=1'>installer</a>/<a href='/guix/log/gnu/installer/connman.scm?id=fb6714d13f734e2ebea2ef7d42f57013dd124478&amp;showmsg=1'>connman.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/installer/connman.scm?id=fb6714d13f734e2ebea2ef7d42f57013dd124478'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2020-09-21 00:31:15 +0200'>2020-09-21</span></td><td class='logsubject'><a href='/guix/commit/gnu/installer/connman.scm?id=e1f3788944ee154ba9b33c891c4ccf039a1ff39a'>installer: Fix docstring typoes.</a></td><td>Tobias Geerinckx-Rice</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/installer/connman.scm (connman-state, run-locale-page)
(start-swapping, stop-swapping, run-installer-steps): Fix typo in
docstring.


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