[libc] printf, putchar and vprintf in bareemetal entrypoints (llvm#95436)

We now have baremetal implementations of these entrypoints.

Author: petrhosek

libc/config/baremetal/arm/entrypoints.txt

@@ -80,8 +80,11 @@ set(TARGET_LIBC_ENTRYPOINTS
 
     # stdio.h entrypoints
     libc.src.stdio.remove
+    libc.src.stdio.printf
+    libc.src.stdio.putchar
     libc.src.stdio.sprintf
     libc.src.stdio.snprintf
+    libc.src.stdio.vprintf
     libc.src.stdio.vsprintf
     libc.src.stdio.vsnprintf
 

libc/config/baremetal/riscv/entrypoints.txt

@@ -80,8 +80,11 @@ set(TARGET_LIBC_ENTRYPOINTS
 
     # stdio.h entrypoints
     libc.src.stdio.remove
+    libc.src.stdio.printf
+    libc.src.stdio.putchar
     libc.src.stdio.sprintf
     libc.src.stdio.snprintf
+    libc.src.stdio.vprintf
     libc.src.stdio.vsprintf
     libc.src.stdio.vsnprintf