Merge #18320: guix: Remove now-unnecessary gcc make flag

0ae42a16c766a7ecb8711bfad6f22b8581ea0258 guix: Remove now-unnecessary gcc make flag (Carl Dong)

Pull request description:

  ```
  Previously, Guix would produce a gcc which did not know to use the SSP
  function from glibc, and required a gcc make flag for it to do so, in my
  attempt to fix it upstream I realized that this is no longer the case.

  This can be verified by performing a Guix build and doing

    readelf -s ... | grep __stack_chk

  to check that symbols are coming from glibc, and doing

    readelf -d ... | grep NEEDED | grep ssp

  to see that libssp.so is not being depended on
  ```

ACKs for top commit:
  fanquake:
    ACK 0ae42a16c766a7ecb8711bfad6f22b8581ea0258 - ran a Guix build (hashes below) and checked all the linux binaries:

Tree-SHA512: 701b91e7c323b12a29af9539cb2656d10ce0a93af573a02e57f0b7fea05a6e1819798536eadb24d0a17e7f35b503f5e863fee5e7409db1b8a3973c4375e49d4e

contrib/guix/manifest.scm

@@ -22,17 +22,6 @@
              (guix profiles)
              (guix utils))
 
-(define (make-ssp-fixed-gcc xgcc)
-  "Given a XGCC package, return a modified package that uses the SSP function
-from glibc instead of from libssp.so. Taken from:
-http://www.linuxfromscratch.org/hlfs/view/development/chapter05/gcc-pass1.html"
-  (package
-   (inherit xgcc)
-   (arguments
-    (substitute-keyword-arguments (package-arguments xgcc)
-      ((#:make-flags flags)
-       `(cons "gcc_cv_libc_provides_ssp=yes" ,flags))))))
-
 (define (make-gcc-rpath-link xgcc)
   "Given a XGCC package, return a modified package that replace each instance of
 -rpath in the default system spec that's inserted by Guix with -rpath-link"
@@ -105,8 +94,7 @@ chain for " target " development."))
                                   (base-gcc-for-libc gcc-5)
                                   (base-kernel-headers linux-libre-headers-4.19)
                                   (base-libc glibc-2.27)
-                                  (base-gcc (make-gcc-rpath-link
-                                             (make-ssp-fixed-gcc gcc-9))))
+                                  (base-gcc (make-gcc-rpath-link gcc-9)))
   "Convenience wrapper around MAKE-CROSS-TOOLCHAIN with default values
 desirable for building Bitcoin Core release binaries."
   (make-cross-toolchain target