[gcc r15-2944] libstdc++-v3: testsuite: Prune uncapitalized "in function" linker warning

https://gcc.gnu.org/g:98e1b19f6690f5e19031ba4f843c22208bbfb14a commit r15-2944-g98e1b19f6690f5e19031ba4f843c22208bbfb14a Author: Hans-Peter Nilsson Date: Wed Aug 14 04:38:05 2024 +0200 libstdc++-v3: testsuite: Prune uncapitalized "in function" linker warning Newer newlib trigger w

[gcc r15-2945] libstdc++-v3: Handle iconv as optional for newlib builds [PR116362]

https://gcc.gnu.org/g:1b8b53ef75c143cddc114705c97c74d9c8f7a64b commit r15-2945-g1b8b53ef75c143cddc114705c97c74d9c8f7a64b Author: Hans-Peter Nilsson Date: Tue Aug 13 19:23:43 2024 +0200 libstdc++-v3: Handle iconv as optional for newlib builds [PR116362] Support for iconv in newlib