add an ld.so.conf file to /etc for the mips arches - it is required

for their broken linux based ld.so to work correctly with non
/usr/lib shared libs

src/etc/etc.arc/ld.so.conf

@@ -0,0 +1,2 @@
+/usr/local/lib
+/usr/X11R6/lib

src/etc/etc.pmax/ld.so.conf

@@ -0,0 +1,2 @@
+/usr/local/lib
+/usr/X11R6/lib

src/etc/etc.wgrisc/ld.so.conf

@@ -0,0 +1,2 @@
+/usr/local/lib
+/usr/X11R6/lib