Add symlinks for md5sum/sha1sum/sha256sum/sha512sum.

Test: clean build
Change-Id: I576d2c1012c6ad2f7028dd41d7019a60958d7cee
diff --git a/toybox/linux-x86/md5sum b/toybox/linux-x86/md5sum
new file mode 120000
index 0000000..c6b4b1f
--- /dev/null
+++ b/toybox/linux-x86/md5sum
@@ -0,0 +1 @@
+../../linux-x86/bin/toybox
\ No newline at end of file
diff --git a/toybox/linux-x86/sha1sum b/toybox/linux-x86/sha1sum
new file mode 120000
index 0000000..c6b4b1f
--- /dev/null
+++ b/toybox/linux-x86/sha1sum
@@ -0,0 +1 @@
+../../linux-x86/bin/toybox
\ No newline at end of file
diff --git a/toybox/linux-x86/sha256sum b/toybox/linux-x86/sha256sum
new file mode 120000
index 0000000..c6b4b1f
--- /dev/null
+++ b/toybox/linux-x86/sha256sum
@@ -0,0 +1 @@
+../../linux-x86/bin/toybox
\ No newline at end of file
diff --git a/toybox/linux-x86/sha512sum b/toybox/linux-x86/sha512sum
new file mode 120000
index 0000000..c6b4b1f
--- /dev/null
+++ b/toybox/linux-x86/sha512sum
@@ -0,0 +1 @@
+../../linux-x86/bin/toybox
\ No newline at end of file