Tweaks for C++ compilation.

Change-Id: I6ac0ffe4941c6d655025a0738413b60b636400a9
diff --git a/opcode-gen/regen-all b/opcode-gen/regen-all
index afe6624..161cda9 100755
--- a/opcode-gen/regen-all
+++ b/opcode-gen/regen-all
@@ -38,9 +38,9 @@
 ${progdir}/opcode-gen dx/src/com/android/dx/dex/code/RopToDop.java
 ${progdir}/opcode-gen dx/src/com/android/dx/io/OpcodeInfo.java
 ${progdir}/opcode-gen dx/src/com/android/dx/io/Opcodes.java
-${progdir}/opcode-gen libdex/DexOpcodes.c
+${progdir}/opcode-gen libdex/DexOpcodes.cpp
 ${progdir}/opcode-gen libdex/DexOpcodes.h
-${progdir}/opcode-gen libdex/InstrUtils.c
+${progdir}/opcode-gen libdex/InstrUtils.cpp
 
 # It's a minor shame that these files live in a different top-level project.
 # So it goes.