Rename mu_strcasestr to mu_c_strcasestr.

* include/mailutils/cstr.h (mu_strcasestr): Rename to mu_c_strcasestr.
* libmailutils/string/cstrcasestr.c: Likewise. All uses changed.

@@ -388,7 +388,7 @@ util_parse_ctime_date (const char *date, time_t * timep)
 char *
 util_strcasestr (const char *haystack, const char *needle)
 {
-  return mu_strcasestr (haystack, needle);
+  return mu_c_strcasestr (haystack, needle);
 }
 
 struct

@@ -27,7 +27,7 @@ int mu_strupper (char *);
 
 int mu_c_strcasecmp (const char *a, const char *b);
 int mu_c_strncasecmp (const char *a, const char *b, size_t n);
-char *mu_strcasestr (const char *haystack, const char *needle);
+char *mu_c_strcasestr (const char *haystack, const char *needle);
 
 size_t mu_rtrim_class (char *str, int __class);
 size_t mu_rtrim_cset (char *str, const char *cset);

@@ -23,12 +23,10 @@
 #include <unistd.h>
 #include <mailutils/cctype.h>
 
-
 /* Based on strstr from GNU libc (Stephen R. van den Berg,
    berg@pool.informatik.rwth-aachen.de) */
-/* FIXME: Rename to mu_c_strcasestr */
 char *
-mu_strcasestr (const char *a_haystack, const char *a_needle)
+mu_c_strcasestr (const char *a_haystack, const char *a_needle)
 {
   register const unsigned char *haystack = (unsigned char*) a_haystack,
     *needle = (unsigned char*) a_needle;

@@ -420,7 +420,7 @@ i_ascii_casemap_is (const char *pattern, const char *text)
 static int
 i_ascii_casemap_contains (const char *pattern, const char *text)
 {
-  return mu_strcasestr (text, pattern) != NULL;
+  return mu_c_strcasestr (text, pattern) != NULL;
 }
 
 static int