Fix locale-dependent float printing in GGUF metadata (#17331)

* Set C locale for consistent float formatting across all binaries.

* Add C locale setting to all tools binaries

Add std::setlocale(LC_NUMERIC, "C") to all 16 binaries in the tools/
directory to ensure consistent floating-point formatting.

* Apply suggestion from @JohannesGaessler

---------

Co-authored-by: Johannes Gäßler <johannesg@5d6.de>

tools/gguf-split/gguf-split.cpp

@@ -6,6 +6,7 @@
 #include <algorithm>
 #include <cinttypes>
 #include <climits>
+#include <clocale>
 #include <cstdio>
 #include <cstdlib>
 #include <stdexcept>
@@ -567,6 +568,8 @@ static void gguf_merge(const split_params & split_params) {
 }
 
 int main(int argc, const char ** argv) {
+    std::setlocale(LC_NUMERIC, "C");
+
     split_params params;
     split_params_parse(argc, argv, params);