add missing malloc() result casts in embedding main program code

Cython/Utility/Embed.c

@@ -95,7 +95,7 @@ __Pyx_char2wchar(char* arg)
     /* Overallocate; as multi-byte characters are in the argument, the
        actual output could use less memory. */
     argsize = strlen(arg) + 1;
-    res = malloc(argsize*sizeof(wchar_t));
+    res = (wchar_t *)malloc(argsize*sizeof(wchar_t));
     if (!res) goto oom;
     in = (unsigned char*)arg;
     out = res;
@@ -138,7 +138,7 @@ __Pyx_char2wchar(char* arg)
     /* Cannot use C locale for escaping; manually escape as if charset
        is ASCII (i.e. escape all bytes > 128. This will still roundtrip
        correctly in the locale's charset, which must be an ASCII superset. */
-    res = malloc((strlen(arg)+1)*sizeof(wchar_t));
+    res = (wchar_t *)malloc((strlen(arg)+1)*sizeof(wchar_t));
     if (!res) goto oom;
     in = (unsigned char*)arg;
     out = res;