m68k: use malloc-standard for MMU targets

target/m68k/uclibc-ng.config

@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# uClibc-ng 1.0.45 C Library Configuration
+# uClibc-ng 1.0.51 C Library Configuration
 #
 # TARGET_aarch64 is not set
 # TARGET_alpha is not set
@@ -95,9 +95,9 @@ PTHREADS_DEBUG_SUPPORT=y
 PTHREADS_STACK_DEFAULT_SIZE=2097152
 UCLIBC_HAS_SYSLOG=y
 UCLIBC_HAS_LFS=y
-MALLOC=y
+# MALLOC is not set
 # MALLOC_SIMPLE is not set
-# MALLOC_STANDARD is not set
+MALLOC_STANDARD=y
 UCLIBC_DYNAMIC_ATEXIT=y
 UCLIBC_HAS_UTMPX=y
 UCLIBC_HAS_UTMP=y