The firmware is cross-compiled, but the build system ends up using
'objcopy' instead of 'xtensa-elf-objcopy' by default.  Force it to
use the right one.

--- source/target_firmware/configure	2014-10-28 20:57:26.834436561 +0100
+++ source/target_firmware/configure	2014-10-28 20:57:29.666436530 +0100
@@ -11,6 +11,7 @@ mkdir -p build
 cat > "$TOOLCHAIN_FILE" <<EOF
 INCLUDE(CMakeForceCompiler)
 
+SET(CMAKE_OBJCOPY xtensa-elf-objcopy)
 SET(CMAKE_SYSTEM_PROCESSOR xtensa)
 SET(CMAKE_FIND_ROOT_PATH ${TOOLCHAIN}/$TARGET)
 SET(CMAKE_STRIP :)
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<tr><td><span title='2023-08-17 17:33:53 +0200'>2023-08-17</span></td><td><a href='/guix/commit/tests/guix-build.sh?id=3363ff1867bb02c4aa4955db917ef1d67f2c47e6'>ui: 'load*' accepts /dev/fd/N files pointing to a pipe.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
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