Failure to build on alpine Linux distributions.

Issue#21

Change-Id: I566289dd99b549c22ce42cd5d1b0eeefb10fe4d4

Author: johnbash

Source/inc/portable_compiler.h

@@ -64,7 +64,9 @@ OTHER DEALINGS IN THE SOFTWARE.
 /* compile-time ASSERT */
 
 #ifndef C_ASSERT
-    #define __UNIQUENAME( a1, a2 )  __CONCAT( a1, a2 )
+    #define __CONCATING( a1, a2 )     a1 ## a2
+
+    #define __UNIQUENAME( a1, a2 )  __CONCATING( a1, a2 )
 
     #define UNIQUENAME( __text )    __UNIQUENAME( __text, __COUNTER__ )