Android patch: convrtrs.txt: Thai customizations.

This change was introduced in Android by the ICU 42 upgrade:

https://android.googlesource.com/platform/external/icu/+/85bf2e2

It was then amended for ICU 56:

https://android.googlesource.com/platform/external/icu/+/cf220d4

(cherry picked from commit b8e12828dcc44d284db517d68999218520695b4c)

Test: n/a
Change-Id: I56b2523aca977d21485164788a5eadcc149a49e5
diff --git a/icu4c/source/data/mappings/convrtrs.txt b/icu4c/source/data/mappings/convrtrs.txt
index 370efc5..f150b51 100644
--- a/icu4c/source/data/mappings/convrtrs.txt
+++ b/icu4c/source/data/mappings/convrtrs.txt
@@ -865,17 +865,20 @@
                         x-Johab { JAVA* }
 
 windows-874-2000 { UTR22* }   # Thai (w/ euro update)
-                        TIS-620 { WINDOWS }
-                        windows-874 { JAVA* WINDOWS* }
-                        MS874 { JAVA }
-                        x-windows-874 { JAVA }
+                        # BEGIN android-changed
+                        TIS-620 { IANA* WINDOWS JAVA }
+                        windows-874 { JAVA WINDOWS* }
+                        MS874 { JAVA* }
+                        # END android-changed
                         # iso-8859-11 { WINDOWS } # iso-8859-11 is similar to TIS-620. ibm-13162 is a closer match.
 
 ibm-874_P100-1995 { UTR22* }    # Thai PC (w/o euro update).
                         ibm-874 { IBM* JAVA }
                         ibm-9066 { IBM }    # Yes ibm-874 == ibm-9066. ibm-1161 has the euro update.
                         cp874 { JAVA* }
-                        TIS-620 { IANA* JAVA }  # This is actually separate from ibm-874, which is similar to this table
+                        # BEGIN android-changed
+                        # TIS-620 { IANA* JAVA }  # This is actually separate from ibm-874, which is similar to this table
+                        # END android-changed
                         tis620.2533 { JAVA }    # This is actually separate from ibm-874, which is similar to this table
                         eucTH               # eucTH is an unusual alias from Solaris.  eucTH has fewer mappings than TIS620
                         x-IBM874 { JAVA }