Merge bitcoin/bitcoin#27345: guix: use GCC tool wrappers

4133c8104f guix: use gcc tool wrappers (fanquake)

Pull request description:

  This way, correct `--plugin` arguments are passed through.

  This is a prerequisite for LTO (see #25391). Split out, to try move things along, as this change is isolated, and should be straight-forward.

ACKs for top commit:
  TheCharlatan:
    ACK [4133c81](4133c8104f)
  hebasto:
    ACK 4133c8104f

Tree-SHA512: 4311a72a613cf027bd4490caa29604c985ed455589acd972285f13cbdf4806d2184a4dc6f20cb6f47c3fa751d58bfd0bacc257b87d4a804bf5ecf5b240e4a757

contrib/guix/libexec/build.sh

@@ -188,9 +188,9 @@ make -C depends --jobs="$JOBS" HOST="$HOST" \
                                    ${SDK_PATH+SDK_PATH="$SDK_PATH"} \
                                    x86_64_linux_CC=x86_64-linux-gnu-gcc \
                                    x86_64_linux_CXX=x86_64-linux-gnu-g++ \
-                                   x86_64_linux_AR=x86_64-linux-gnu-ar \
-                                   x86_64_linux_RANLIB=x86_64-linux-gnu-ranlib \
-                                   x86_64_linux_NM=x86_64-linux-gnu-nm \
+                                   x86_64_linux_AR=x86_64-linux-gnu-gcc-ar \
+                                   x86_64_linux_RANLIB=x86_64-linux-gnu-gcc-ranlib \
+                                   x86_64_linux_NM=x86_64-linux-gnu-gcc-nm \
                                    x86_64_linux_STRIP=x86_64-linux-gnu-strip \
                                    FORCE_USE_SYSTEM_CLANG=1