Add strcase*

Author: palfrey

src/lib.rs

@@ -280,6 +280,9 @@ extern "C" {
     pub fn strdup(cs: *const c_char) -> *mut c_char;
     pub fn strpbrk(cs: *const c_char, ct: *const c_char) -> *mut c_char;
     pub fn strstr(cs: *const c_char, ct: *const c_char) -> *mut c_char;
+    pub fn strcasestr(cs: *const c_char, ct: *const c_char) -> *mut c_char;
+    pub fn strcasecmp(s1: *const c_char, s2: *const c_char) -> c_int;
+    pub fn strncasecmp(s1: *const c_char, s2: *const c_char, n: size_t) -> c_int;
     pub fn strlen(cs: *const c_char) -> size_t;
     pub fn strnlen(cs: *const c_char, maxlen: size_t) -> size_t;
     #[cfg_attr(