How can I enable DNS Suffix support on Android? (resolv.conf search)
I haven't tried this, but a quick look at Android's bionic libc sources seems to indicate that Android might use /etc/ppp/resolv.conf:

(from http://code.metager.de/source/xref/android/4.1.1/bionic/libc/private/resolv_private.h#113)

 92 /*
 93  * Resolver configuration file.
 94  * Normally not present, but may contain the address of the
 95  * initial name server(s) to query and the domain search list.
 96  */
 97
 98 #ifndef _PATH_RESCONF
 99 #ifdef ANDROID_CHANGES
100 #define _PATH_RESCONF        "/etc/ppp/resolv.conf"
101 #else
102 #define _PATH_RESCONF        "/etc/resolv.conf"
103 #endif
104 #endif