build: correct build entry for memalignment

Author: hulxv

libc/src/stdlib/CMakeLists.txt

@@ -350,6 +350,16 @@ add_entrypoint_external(
   DEPENDS
     ${SCUDO_DEPS}
 )
+add_entrypoint_object(
+  memalignment
+  SRCS
+    memalignment.cpp
+  HDRS
+    memalignment.h
+  DEPENDS
+    libc.src.__support.common
+    libc.src.__support.CPP.cstddef
+)
 
 if(NOT LIBC_TARGET_OS_IS_BAREMETAL AND NOT LIBC_TARGET_OS_IS_GPU)
   if(LLVM_LIBC_INCLUDE_SCUDO)
@@ -420,9 +430,6 @@ if(NOT LIBC_TARGET_OS_IS_BAREMETAL AND NOT LIBC_TARGET_OS_IS_GPU)
     add_entrypoint_external(
       malloc
     )
-    add_entrypoint_external(
-      memalignment
-    )
     add_entrypoint_external(
       calloc
     )

libc/src/stdlib/memalignment.h

@@ -10,7 +10,7 @@
 #define LLVM_LIBC_SRC_STDLIB_MEM_ALIGNMENT_H
 
 #include "src/__support/macros/config.h"
-#include <stddef.h>
+#include "src/__support/CPP/cstddef.h"
 
 namespace LIBC_NAMESPACE_DECL {