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=cdbd81ce144f17644ceebd3d08723aa244696a05'>root</a>/<a href='/guix/log/gnu?id=cdbd81ce144f17644ceebd3d08723aa244696a05'>gnu</a>/<a href='/guix/log/gnu/packages?id=cdbd81ce144f17644ceebd3d08723aa244696a05'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=cdbd81ce144f17644ceebd3d08723aa244696a05'>patches</a>/<a href='/guix/log/gnu/packages/patches/python-scikit-optimize-1148.patch?id=cdbd81ce144f17644ceebd3d08723aa244696a05'>python-scikit-optimize-1148.patch</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/packages/patches/python-scikit-optimize-1148.patch?id=cdbd81ce144f17644ceebd3d08723aa244696a05&amp;s<tr><td><span title='2020-05-01 22:06:33 +0200'>2020-05-01</span></td><td><a href='/guix/commit/gnu/packages/patches/guile-3.0-relocatable.patch?id=3ba23f0582a432dfc04bfbf58f375f6643caae19'>gnu: Add relocatable static Guile 3.0 variant.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/guile-2.2-default-utf8.patch: New file, extracted from
commit 2acfe022a740f79b593348cc6362cc4ee8f33bb4.
* gnu/packages/patches/guile-3.0-linux-syscalls.patch,
gnu/packages/patches/guile-3.0-relocatable.patch: New files.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.  Move all Guile patches
together while at it.
* gnu/packages/make-bootstrap.scm (%guile-3.0-static-stripped): New public variable.
</span></span></td><td>Marius Bakke</td></tr>
ch that won't silently break in the future.
* gnu/packages/patches/gajim-honour-GAJIM_PLUGIN_PATH.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>