gnu: make-bootstrap: Remove obsolete patch for i686-linux.

Followup to 2c51202a2a.
The issue has been resolved with glibc-2.40
(see glibc commit 0b716305dfb48c2d13ed4f7d06c082b90c1d226f).

* gnu/packages/make-bootstrap.scm (glibc-for-bootstrap)[arguments]: Remove
'apply-libm-patch on i686.
* gnu/packages/patches/glibc-2.39-fmod-libm-a.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Remove it.

Change-Id: If6c44497ff54390688345083ca6e8cebecc71ee9
Signed-off-by: Andreas Enge <andreas@enge.fr>

gnu/packages/make-bootstrap.scm

@@ -85,18 +85,7 @@ for `sh' in $PATH, and without nscd, and with static NSS modules."
           ;; and can use statically-linked NSS modules.
           `(cons* "--disable-nscd" "--disable-build-nscd"
                   "--enable-static-nss"
-                  ,flags))
-         ((#:phases phases #~%standard-phases)
-          ;; Apply i686-linux-specific patch.
-          (if (target-x86-32?)
-              #~(modify-phases #$phases
-                  (add-after 'unpack 'apply-libm-patch
-                    (lambda _
-                      (define patch
-                        #$(local-file
-                           (search-patch "glibc-2.39-fmod-libm-a.patch")))
-                      (invoke "patch" "--force" "-p1" "-i" patch))))
-              phases))))
+                  ,flags))))
 
       ;; Remove the 'debug' output to allow bit-reproducible builds (when the
       ;; 'debug' output is used, ELF files end up with a .gnu_debuglink, which