Merge bitcoin/bitcoin#34309: guix: stop passing depends sources to codesigning

d94d7b1 guix: stop passing depends sources to codesigning (fanquake)

Pull request description:

  I think this is just a copy-pasta from the build container (which has existed since this file was introduced in 38eb91e). I don't see why we'd need the depends sources available when performing codesigning.

ACKs for top commit:
  hebasto:
    ACK d94d7b1, I have reviewed the code and it looks OK.
  willcl-ark:
    ACK d94d7b1
  sedited:
    tACK d94d7b1

Tree-SHA512: 972b15aa022b79602f40c198187a54d85ceeee0014fd2232ca967bb52e4624cbb85b3ef1cdeac3ccd8c7b337a13c3be9c90291141495c8136a8e72ad2cd4ec4a

Author: sedited

contrib/guix/guix-codesign

@@ -328,16 +328,6 @@ EOF
         #     container so that we have something to build. '/bitcoin' was
         #     chosen arbitrarily.
         #
-        #   ${SOURCES_PATH:+--share="$SOURCES_PATH"}
-        #
-        #                     make the downloaded depends sources path available
-        #                     inside the isolated container
-        #
-        #     The isolated container has no network access as it's in a
-        #     different network namespace from the main machine, so we have to
-        #     make the downloaded depends sources available to it. The sources
-        #     should have been downloaded prior to this invocation.
-        #
         #  ${SUBSTITUTE_URLS:+--substitute-urls="$SUBSTITUTE_URLS"}
         #
         #                     fetch substitute from SUBSTITUTE_URLS if they are
@@ -359,7 +349,6 @@ EOF
                                  --share="$DETACHED_SIGS_REPO"=/detached-sigs \
                                  --expose="$(git rev-parse --git-common-dir)" \
                                  --expose="$(git -C "$DETACHED_SIGS_REPO" rev-parse --git-common-dir)" \
-                                 ${SOURCES_PATH:+--share="$SOURCES_PATH"} \
                                  --cores="$JOBS" \
                                  --keep-failed \
                                  --fallback \
@@ -372,7 +361,6 @@ EOF
                                         JOBS="$JOBS" \
                                         SOURCE_DATE_EPOCH="${SOURCE_DATE_EPOCH:?unable to determine value}" \
                                         ${V:+V=1} \
-                                        ${SOURCES_PATH:+SOURCES_PATH="$SOURCES_PATH"} \
                                         DISTSRC="$(DISTSRC_BASE=/distsrc-base && distsrc_for_host "$HOST")" \
                                         OUTDIR="$(OUTDIR_BASE=/outdir-base && outdir_for_host "$HOST" codesigned)" \
                                         DIST_ARCHIVE_BASE=/outdir-base/dist-archive \