Per discussion on the mailing list, simply vfork -> fork mapping to only apply

iff we do not have vfork available, which is simpler and more reasonable.
 -Erik

libc/stdio/popen.c

@@ -14,7 +14,7 @@
 
 /* uClinux-2.0 has vfork, but Linux 2.0 doesn't */
 #include <sys/syscall.h>
-#if ! defined __NR_vfork && defined __UCLIBC_HAS_MMU__ 
+#if ! defined __NR_vfork
 #define vfork fork	
 #endif
 

libc/stdlib/system.c

@@ -6,7 +6,7 @@
 
 /* uClinux-2.0 has vfork, but Linux 2.0 doesn't */
 #include <sys/syscall.h>
-#if ! defined __NR_vfork && defined __UCLIBC_HAS_MMU__ 
+#if ! defined __NR_vfork
 #define vfork fork	
 #endif
 

libc/stdlib/unix_grantpt.c

@@ -33,7 +33,7 @@
 
 /* uClinux-2.0 has vfork, but Linux 2.0 doesn't */
 #include <sys/syscall.h>
-#if ! defined __NR_vfork && defined __UCLIBC_HAS_MMU__ 
+#if ! defined __NR_vfork
 #define vfork fork	
 #endif