Disable CPU optimizations not supported by all x86_64 systems.

--- a/cmake/modules/SIMDExt.cmake	2017-03-23 22:22:58.254071694 +0100
+++ b/cmake/modules/SIMDExt.cmake	2017-03-23 22:23:22.446848845 +0100
@@ -5,11 +5,6 @@
 # HAVE_ARM_NEON
 # HAVE_INTEL_SSE
 # HAVE_INTEL_SSE2
-# HAVE_INTEL_SSE3
-# HAVE_INTEL_SSSE3
-# HAVE_INTEL_PCLMUL
-# HAVE_INTEL_SSE4_1
-# HAVE_INTEL_SSE4_2
 #
 # SIMD_COMPILE_FLAGS
 #
@@ -85,26 +80,6 @@
       if(HAVE_INTEL_SSE2)
         set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse2")
       endif()
-      CHECK_C_COMPILER_FLAG(-msse3 HAVE_INTEL_SSE3)
-      if(HAVE_INTEL_SSE3)
-        set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse3")
-      endif()
-      CHECK_C_COMPILER_FLAG(-mssse3 HAVE_INTEL_SSSE3)
-      if(HAVE_INTEL_SSSE3)
-        set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -mssse3")
-      endif()
-      CHECK_C_COMPILER_FLAG(-mpclmul HAVE_INTEL_PCLMUL)
-      if(HAVE_INTEL_PCLMUL)
-        set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -mpclmul")
-      endif()
-      CHECK_C_COMPILER_FLAG(-msse4.1 HAVE_INTEL_SSE4_1)
-      if(HAVE_INTEL_SSE4_1)
-        set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse4.1")
-      endif()
-      CHECK_C_COMPILER_FLAG(-msse4.2 HAVE_INTEL_SSE4_2)
-      if(HAVE_INTEL_SSE4_2)
-        set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse4.2")
-      endif()
     endif(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64|AMD64")
   endif(CMAKE_SYSTEM_PROCESSOR MATCHES "i686|amd64|x86_64|AMD64")
 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(powerpc|ppc)64le")
vices.scm'>
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<div class='path'>path: <a href='/guix/log/?id=1944b3baf40f55e688d5ccf7f7ed0c5781f5060b'>root</a>/<a href='/guix/log/gnu?id=1944b3baf40f55e688d5ccf7f7ed0c5781f5060b'>gnu</a>/<a href='/guix/log/gnu/services.scm?id=1944b3baf40f55e688d5ccf7f7ed0c5781f5060b'>services.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/services.scm?id=1944b3baf40f55e688d5ccf7f7ed0c5781f5060b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-06-06 13:38:35 +0200'>2023-06-06</span></td><td><a href='/guix/commit/gnu/services.scm?id=1a2eb26286c72ac2754969f53f5833b053b96b67'>services: Check if service is #f before applying clause.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services.scm (apply-clauses): Check if service is #f before trying to
apply clause.  Follow up of 181951207339508789b28ba7cb914f983319920f.
</span></span></td><td>Josselin Poiret</td></tr>
<tr><td><span title='2023-06-06 11:54:39 +0200'>2023-06-06</span></td><td><a href='/guix/commit/gnu/services.scm?id=181951207339508789b28ba7cb914f983319920f'>services: 'modify-services' preserves service ordering.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://issues.guix.gnu.org/63921&gt;.

The regression was introduced in
dbbc7e946131ba257728f1d05b96c4339b7ee88b, which changed the order of
services.  As a result, someone using 'modify-services' could find
themselves with incorrect ordering of expressions in the "boot" script,
whereby the cleanup expressions would come after (execl ".../shepherd").
This, in turn, would lead shepherd to error out at boot with EADDRINUSE
on /var/run/shepherd/socket.

* gnu/services.scm (%delete-service, %apply-clauses): Remove.
(clause-alist): New macro.
(apply-clauses): New procedure.
(modify-services): Use it.  Adjust docstring.
* tests/services.scm ("modify-services: do nothing"): Remove 'sort' call.
("modify-services: delete service"): Likewise, and add 't4' service.
("modify-services: change value"): Remove 'sort' call and fix expected value.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-06-02 16:23:03 +0200'>2023-06-02</span></td><td><a href='/guix/commit/gnu/services.scm?id=dbbc7e946131ba257728f1d05b96c4339b7ee88b'>services: Error in MODIFY-SERVICES when services don't exist</a><span class='msg-avail'>...<span class='msg-tooltip'>This patch causes MODIFY-SERVICES to raise an error if a reference is made to
a service which isn't in its service list. This it to help users notice if
they have an invalid rule, which is currently silently ignored.

* gnu/services.scm (%delete-service):  new procedure
(%apply-clauses): new syntax rule
(%modify-service): remove syntax rule

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Brian Cully</td></tr>
<tr><td><span title='2023-05-16 19:45:27 +0400'>2023-05-16</span></td><td><a href='/guix/commit/gnu/services.scm?id=66ecffbeba0685ff2f1071db8aeb2393986afb97'>services: Add default values.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services.scm (boot-service-type, activation-service-type,
etc-service-type, profile-service-type): Add default-value.
* gnu/system/shadow.scm (account-service-type): Add default-value.
</span></span></td><td>Andrew Tropin</td></tr>
<tr><td><span title='2023-03-16 12:37:03 +0100'>2023-03-16</span></td><td><a href='/guix/commit/gnu/services.scm?id=93918c67c5761d8f688cda5f5b49d5c49c7626d0'>services: etc-service: Deprecate etc-service procedure.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services.scm (etc-service): Deprecate procedure.
* gnu/system.scm (operating-system-etc-service): Replace etc-service
with etc-service-type.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Bruno Victal</td></tr>