[WIP][libc] Add freelist malloc

Author: PiJoules

libc/config/baremetal/riscv/entrypoints.txt

@@ -170,6 +170,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdlib.ldiv
     libc.src.stdlib.llabs
     libc.src.stdlib.lldiv
+    libc.src.stdlib.malloc
     libc.src.stdlib.qsort
     libc.src.stdlib.rand
     libc.src.stdlib.srand

libc/src/stdlib/CMakeLists.txt

@@ -380,8 +380,20 @@ elseif(LIBC_TARGET_OS_IS_GPU)
     aligned_alloc
   )
 else()
-  add_entrypoint_external(
+  add_entrypoint_object(
     malloc
+    SRCS
+      freelist_malloc.cpp
+    HDRS
+      malloc.h
+    DEPENDS
+      libc.src.__support.CPP.new
+      libc.src.__support.CPP.optional
+      libc.src.__support.CPP.span
+      libc.src.__support.CPP.type_traits
+      libc.src.__support.fixedvector
+      libc.src.string.memcpy
+      libc.src.string.memset
   )
   add_entrypoint_external(
     free