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)
 
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<tr><td><span title='2018-11-01 12:36:47 +0100'>2018-11-01</span></td><td><a href='/guix/commit/po/doc?id=1e40e70bfebba47ccea354ddf862276d2c4223ea'>doc: Add German translation.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-08-26 12:43:49 +0200'>2018-08-26</span></td><td><a href='/guix/commit/po/doc?id=1d8d69c863ae88d5fc20e52e49a22f68c531c1db'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-08-15 18:54:29 +0200'>2018-08-15</span></td><td><a href='/guix/commit/po/doc?id=524756d127a80beebef04b028fa73b8a99617fe0'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-06-23 16:23:50 +0200'>2018-06-23</span></td><td><a href='/guix/commit/po/doc?id=2cf2c778846153f3d5a56e98232fbef6f71b57a6'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-06-13 18:50:41 +0200'>2018-06-13</span></td><td><a href='/guix/commit/po/doc?id=8c655f31db66a27730cae7c97ba001899143101b'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-06-08 20:38:41 +0200'>2018-06-08</span></td><td><a href='/guix/commit/po/doc?id=7f3f72b292b218873fe3379d5dc5cdae5c4f4747'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-06-08 17:04:23 +0200'>2018-06-08</span></td><td><a href='/guix/commit/po/doc?id=dd8646555a979c563e9890dd1189b4d6a4ed4db7'>doc: Update 'fr' translation.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-04-29 21:42:14 +0200'>2018-04-29</span></td><td><a href='/guix/commit/po/doc?id=39764ef893b7b65a8ce55e13746fed8fd0bad6e0'>build: Use only one domain for guix-manual.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
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<tr><td><span title='2018-04-19 21:30:30 +0200'>2018-04-19</span></td><td><a href='/guix/commit/po/doc?id=b9fe8fd662180e64156d2b95a671242c20f0acfc'>gnu: doc: Allow documentation to be translated.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>