tests: fix clang "duplicate 'const' declaration specifier" warnings

* tests/ksysent.c (pstr_t): Remove second const specifier.
* tests/mmsg.c (main): Remove second const specifier from one[], two[],
and three[].
diff --git a/tests/ksysent.c b/tests/ksysent.c
index 1d09917..66b4ffb 100644
--- a/tests/ksysent.c
+++ b/tests/ksysent.c
@@ -45,7 +45,7 @@
 #include "syscallent.h"
 };
 
-typedef const char const *pstr_t;
+typedef const char *pstr_t;
 static const pstr_t ksyslist[] = {
 #include "ksysent.h"
 };
diff --git a/tests/mmsg.c b/tests/mmsg.c
index 0c9c711..ba7fc3e 100644
--- a/tests/mmsg.c
+++ b/tests/mmsg.c
@@ -90,9 +90,9 @@
 	assert(R == sv[0]);
 	assert(W == sv[1]);
 
-	static const char const one[] = "one";
-	static const char const two[] = "two";
-	static const char const three[] = "three";
+	static const char one[] = "one";
+	static const char two[] = "two";
+	static const char three[] = "three";
 	void *copy_one = tail_memdup(one, sizeof(one) - 1);
 	void *copy_two = tail_memdup(two, sizeof(two) - 1);
 	void *copy_three = tail_memdup(three, sizeof(three) - 1);