[libc][Obvious] Remove an unnecessary dep and use inline_memcpy.

An unnecessary dep of the getenv function is removed. From the x86_64
loader, a call to __llvm_libc::memcpy is replaced with call to
__llvm_libc::inline_memcpy.

libc/loader/linux/x86_64/CMakeLists.txt

@@ -7,7 +7,7 @@ add_loader_object(
     libc.include.sys_mman
     libc.include.sys_syscall
     libc.src.__support.OSUtil.osutil
-    libc.src.string.memcpy
+    libc.src.string.memory_utils.memcpy_implementation
   COMPILE_OPTIONS
     -fno-omit-frame-pointer
     -ffreestanding # To avoid compiler warnings about calling the main function.

libc/loader/linux/x86_64/start.cpp

@@ -8,7 +8,7 @@
 
 #include "config/linux/app.h"
 #include "src/__support/OSUtil/syscall.h"
-#include "src/string/memcpy.h"
+#include "src/string/memory_utils/memcpy_implementations.h"
 
 #include <asm/prctl.h>
 #include <linux/auxvec.h>
@@ -64,7 +64,8 @@ void initTLS() {
   uintptr_t endPtr = reinterpret_cast<uintptr_t>(tlsAddr) + tlsSize;
   *reinterpret_cast<uintptr_t *>(endPtr) = endPtr;
 
-  __llvm_libc::memcpy(tlsAddr, reinterpret_cast<const void *>(app.tls.address),
+  __llvm_libc::inline_memcpy(reinterpret_cast<char *>(tlsAddr),
+                             reinterpret_cast<const char *>(app.tls.address),
                              app.tls.size);
   if (__llvm_libc::syscall(SYS_arch_prctl, ARCH_SET_FS, endPtr) == -1)
     __llvm_libc::syscall(SYS_exit, 1);

libc/src/stdlib/CMakeLists.txt

@@ -46,7 +46,6 @@ add_entrypoint_object(
     getenv.h
   DEPENDS
     libc.config.linux.app_h
-    libc.src.string.strncmp
 )
 
 add_entrypoint_object(