PRODKERNEL: strip multiple kpatch-cc prefixes

For debugging kpatch-build, cope with a confused state where the
kpatch-cc prefix is applied twice. When stable this should not happen,
and should be complained of. While developing, just peel them off

Tested: with later commits

Upstream-Plan: 190514358
Signed-off-by: Pete Swain <[email protected]>

Author: swine

kpatch-build/kpatch-cc

@@ -4,6 +4,12 @@ if [[ ${KPATCH_GCC_DEBUG:-0} -ne 0 ]]; then
 	set -o xtrace
 fi
 
+# cope with multiply-prefixed invocation
+while [[ "$1" =~ /kpatch-cc$ ]]; do
+  echo >&2 kpatch-cc: stuttered prefix
+  shift
+done
+
 TOOLCHAINCMD="$1"
 shift