mark static and add to riscv and aarch64

Author: michaelrj-google

libc/config/linux/aarch64/entrypoints.txt

@@ -969,6 +969,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.stdio.getc_unlocked
     libc.src.stdio.getchar
     libc.src.stdio.getchar_unlocked
+    libc.src.stdio.perror
     libc.src.stdio.putc
     libc.src.stdio.putchar
     libc.src.stdio.puts

libc/config/linux/riscv/entrypoints.txt

@@ -1095,6 +1095,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.stdio.getc_unlocked
     libc.src.stdio.getchar
     libc.src.stdio.getchar_unlocked
+    libc.src.stdio.perror
     libc.src.stdio.putc
     libc.src.stdio.putchar
     libc.src.stdio.puts

libc/src/stdio/generic/perror.cpp

@@ -15,7 +15,7 @@
 
 namespace LIBC_NAMESPACE_DECL {
 
-int write_out(cpp::string_view str_view, File *f) {
+static int write_out(cpp::string_view str_view, File *f) {
   if (str_view.size() > 0) {
     auto result = f->write_unlocked(str_view.data(), str_view.size());
     if (result.has_error())
@@ -26,7 +26,8 @@ int write_out(cpp::string_view str_view, File *f) {
 
 // separate function so that we can return early on error but still get the
 // unlock. This function sets errno and should not be called elsewhere.
-void write_sequence(cpp::string_view str_view, cpp::string_view err_str) {
+static void write_sequence(cpp::string_view str_view,
+                           cpp::string_view err_str) {
   int write_err;
   // TODO: this seems like there should be some sort of queue system to
   // deduplicate this code.