gcc-runtime: Package libstdc++.modules.json

libstdc++.modules.json is new file in libstdc++ from GCC-15
it is the module mapping file used in C++ projects that
utilize C++20 modules

(From OE-Core rev: bbfe7ee5b64618649eb8aff753b444c97313e617)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-runtime.inc

@@ -205,6 +205,7 @@ FILES:libstdc++-dev = "\
     ${libdir}/libstdc++.so \
     ${libdir}/libstdc++*.la \
     ${libdir}/libsupc++.la \
+    ${libdir}/libstdc++.modules.json \
 "
 SUMMARY:libstdc++-dev = "GNU standard C++ library - development files"
 FILES:libstdc++-staticdev = "\