Update the list of tested systems.

doc/DEV.md

@@ -33,8 +33,10 @@ List of tested systems
 * gcc 4.9 on linux/x86-64
 * gcc 7 on linux/x86-64
 * clang 3.5 on linux/x86-64
-* clang 4 on linux/x86-64
+* clang 4.0 on linux/x86-64
 * g++ 7 on linux/x86-64
 * tcc on linux/x86-64
 * gcc 6 on windows/x86-64
 * gcc 4.9 on linux/powerpc
+* gcc 6 on linux/armv7l
+* clang 3.8 on linux/armv7l