Remove references to bundled mbedtls library to use the one from inputs.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1e27d21..f0eb1a5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -85,13 +85,6 @@ endif()
 
 set(USE_STATIC_MBEDTLS_LIBRARY ON)
 set(USE_SHARED_MBEDTLS_LIBRARY OFF)
-add_subdirectory("lib/mbedtls" EXCLUDE_FROM_ALL)
-
-# Compile the mbedtls library as a static with position independent code,
-# because we need it for both a shared and static library
-set_property(TARGET mbedtls PROPERTY POSITION_INDEPENDENT_CODE ON)
-set_property(TARGET mbedcrypto PROPERTY POSITION_INDEPENDENT_CODE ON)
-set_property(TARGET mbedx509 PROPERTY POSITION_INDEPENDENT_CODE ON)
 
 add_subdirectory(src)
 
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<div class='path'>path: <a href='/guix/log/?id=7ff54bc907dc6035d1ade27eaaadc9614ecc507c'>root</a>/<a href='/guix/log/gnu?id=7ff54bc907dc6035d1ade27eaaadc9614ecc507c'>gnu</a>/<a href='/guix/log/gnu/installer.scm?id=7ff54bc907dc6035d1ade27eaaadc9614ecc507c'>installer.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.scm?id=7ff54bc907dc6035d1ade27eaaadc9614ecc507c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-01-14 14:29:08 +0100'>2022-01-14</span></td><td><a href='/guix/commit/gnu/installer.scm?id=ee897e5f51104f41b3c2a0c2cbc7eb4e6c1e4d3e'>installer: Check if ci.guix.gnu.org can be reached.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer.scm (installer-program): Add gnutls extension.
* gnu/installer/newt/network.scm (wait-service-online): Check if the CI server
can be reached.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2021-09-23 18:17:18 +0200'>2021-09-23</span></td><td><a href='/guix/commit/gnu/installer.scm?id=f34b8087411cffb0a572c0ecdce92084f0593fd4'>installer: Support XFS.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/newt/partition.scm (run-fs-type-page): Add ‘xfs’ to the
list box.
* gnu/installer/parted.scm (user-fs-type-name, user-fs-type-&gt;mount-type)
(partition-filesystem-user-type): Add ‘xfs’ mapping.
(create-xfs-file-system): New procedure.
(format-user-partitions): Use it.
* gnu/installer.scm (set-installer-path): Add xfsprogs.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-01-12 16:40:27 +0100'>2021-01-12</span></td><td><a href='/guix/commit/gnu/installer.scm?id=bb4e67415eb6d9871ee1b50b0a01e08c19f4809a'>installer: Fix crash in parameters menu.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes: &lt;https://issues.guix.gnu.org/45378&gt;.

* gnu/installer/newt/keymap.scm (run-layout-page): Return false when
"Continue" button is pressed.
(run-keymap-page): Do not try to compute variants if layout is false. Also do
not try to format the result if layout is false.
* gnu/installer.scm (compute-keymap-step): Do not apply keymap if
"run-keymap-page" returns false.
</span></span></td><td>Mathieu Othacehe</td></tr>