configure: Set the library prefix to "lib" on Android.

configure

@@ -6903,6 +6903,7 @@ clean::
   linux-android*)
     DLLFLAGS="$DLLFLAGS -fPIC"
     DLLEXT=".so"
+    DLLPREFIX="lib"
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -fPIC -Wl,--export-dynamic" >&5
 $as_echo_n "checking whether the compiler supports -fPIC -Wl,--export-dynamic... " >&6; }
 if ${ac_cv_cflags__fPIC__Wl___export_dynamic+:} false; then :

configure.ac

@@ -872,6 +872,7 @@ clean::
   linux-android*)
     DLLFLAGS="$DLLFLAGS -fPIC"
     DLLEXT=".so"
+    DLLPREFIX="lib"
     WINE_TRY_CFLAGS([-fPIC -Wl,--export-dynamic],
                     [AC_SUBST(LDEXECFLAGS,["-Wl,--export-dynamic"])])
     WINE_TRY_CFLAGS([-fPIC -Wl,--rpath,\$ORIGIN/../lib],