Add -D_DEFAULT_SOURCE for strlcat/strlcpy provided by glibc >= 2.38. #7055
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As reported in Debian Bug #1067651 MapServer failed to build on Ubuntu noble with glibc 2.39.
strlcpyandstrlcatwere introduced in glibc 2.38 but require-D_DEFAULT_SOURCEto actually work after being detected bycheck_function_exists().