opencv: rewrite build-tree paths in all CPU-dispatch stub files

The recipe already rewrote the absolute ${S} path embedded in two
PowerPC VSX3 dispatch stubs (arithm.vsx3.cpp, convert.vsx3.cpp) before
packaging, but OpenCV's cmake ocv_add_dispatched_file() macro generates
one such stub per enabled ISA in every module (avx, avx2, avx512_skx,
sse4_1, sse4_2, ...). On x86-64-v3 that produced 69 more stub files
under ${B}/modules/* whose #include lines still embedded the raw
build-tree path, tripping the buildpaths QA check (TMPDIR and HOME)
once copied verbatim into the opencv-src package.

OEQA_BUILDPATHS_SKIP would only silence the HOME-directory half of the
check; TMPDIR has no skip mechanism in insane.bbclass. Generalize the
existing sed-based rewrite to find and fix every generated dispatch
stub under ${B}/modules, instead of a hardcoded two-file list, so any
ISA/module combination is covered.

AI-Generated: Uses Claude Code
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/opencv/opencv_4.14.0.bb

@@ -214,10 +214,8 @@ do_install:append() {
         rm -rf ${D}${bindir}/setup_vars_opencv4.sh
     fi
 
-    for fn in arithm.vsx3.cpp convert.vsx3.cpp; do
-        if [ -f ${B}/modules/core/$fn ]; then
-            sed -i -e 's,${S},/usr/src/debug/${PN}/${PV},g' ${B}/modules/core/$fn
-        fi
+    find ${B}/modules -name "*.cpp" | xargs -r grep -l "${S}" | while read -r fn; do
+        sed -i -e 's,${S},/usr/src/debug/${PN}/${PV},g' "$fn"
     done
 
     if [ -d ${D}/${bindir}/shape ]; then