Fix missing symlinks for Mesa3D build.

For some reason, these links were missing, making the SCons Mesa3D
build fail at link time.

Change-Id: I46c236e37574ade2234a9215499ac687d0e1331d
diff --git a/sysroot/usr/lib/libXdamage.so b/sysroot/usr/lib/libXdamage.so
new file mode 120000
index 0000000..28a298c
--- /dev/null
+++ b/sysroot/usr/lib/libXdamage.so
@@ -0,0 +1 @@
+libXdamage.so.1
\ No newline at end of file
diff --git a/sysroot/usr/lib/libXext.so b/sysroot/usr/lib/libXext.so
new file mode 120000
index 0000000..9ed41ff
--- /dev/null
+++ b/sysroot/usr/lib/libXext.so
@@ -0,0 +1 @@
+libXext.so.6
\ No newline at end of file
diff --git a/sysroot/usr/lib/libXfixes.so b/sysroot/usr/lib/libXfixes.so
new file mode 120000
index 0000000..b0ff625
--- /dev/null
+++ b/sysroot/usr/lib/libXfixes.so
@@ -0,0 +1 @@
+libXfixes.so.3
\ No newline at end of file