libs : rename libcommon -> libllama-common (#21936)

* cmake : allow libcommon to be shared

* cmake : rename libcommon to libllama-common

* cont : set -fPIC for httplib

* cont : export all symbols

* cont : fix build_info exports

* libs : add libllama-common-base

* log : add common_log_get_verbosity_thold()

tools/cvector-generator/cvector-generator.cpp

@@ -2,6 +2,7 @@
 #include "gguf.h"
 
 #include "arg.h"
+#include "build-info.h"
 #include "common.h"
 #include "llama.h"
 #include "pca.hpp"
@@ -420,7 +421,7 @@ int main(int argc, char ** argv) {
     params.cb_eval_user_data = &cb_data;
     params.warmup = false;
 
-    print_build_info();
+    llama_print_build_info();
     llama_backend_init();
     llama_numa_init(params.numa);