a6db8971bf
...to avoid construction of temporary O(U)Strings, in anticipation of using
C++17 std::from_chars once that is available in all our baselines, similar to
99a1290b3f "Use existing rtl_math_stringToDouble"
Change-Id: Ib92504341c3ae9dd599f91725b0af5b7219a201d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/122219
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>