Revert "handy.h: Add void * casts to memEQ, memNE"

This reverts commit 9d3980b.

It can create problems to add casts to macros; potentially hiding real
issues.  These casts caused Tony Cook some lost time recently; whatever
the cause for this commit isn't showing up on my box; so I'll try
reverting it to see if something shows up on some other platform.

Author: khwilliamson

handy.h

@@ -690,8 +690,8 @@ based on the underlying C library functions):
 #define strnNE(s1,s2,l) (strncmp(s1,s2,l) != 0)
 #define strnEQ(s1,s2,l) (strncmp(s1,s2,l) == 0)
 
-#define memEQ(s1,s2,l) (memcmp(((const void *) (s1)), ((const void *) (s2)), l) == 0)
-#define memNE(s1,s2,l) (! memEQ(s1,s2,l))
+#define memNE(s1,s2,l) (memcmp(s1,s2,l) != 0)
+#define memEQ(s1,s2,l) (memcmp(s1,s2,l) == 0)
 
 /* memEQ and memNE where second comparand is a string constant */
 #define memEQs(s1, l, s2) \