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/tokenize/tokenize.cpp

@@ -2,6 +2,7 @@
 //#include "log.h" // TODO: start using log.h
 #include "llama.h"
 
+#include <clocale>
 #include <cstdio>
 #include <cstring>
 #include <fstream>
@@ -184,6 +185,8 @@ static void write_utf8_cstr_to_stdout(const char * str, bool & invalid_utf8) {
 }
 
 int main(int raw_argc, char ** raw_argv) {
+    std::setlocale(LC_NUMERIC, "C");
+
     const std::vector<std::string> argv = ingest_args(raw_argc, raw_argv);
     const int argc = argv.size();