Add a "fork" of musl as //fusl.

fusl/src/locale/c_locale.c

Index: fusl/src/locale/c_locale.c
diff --git a/fusl/src/locale/c_locale.c b/fusl/src/locale/c_locale.c
new file mode 100644
index 0000000000000000000000000000000000000000..77ccf58736e72d6dcc98dcc6d103d4a5d416d599
--- /dev/null
+++ b/fusl/src/locale/c_locale.c
@@ -0,0 +1,15 @@
+#include "locale_impl.h"
+#include <stdint.h>
+
+static const uint32_t empty_mo[] = { 0x950412de, 0, -1, -1, -1 };
+
+const struct __locale_map __c_dot_utf8 = {
+	.map = empty_mo,
+	.map_size = sizeof empty_mo,
+	.name = "C.UTF-8"
+};
+
+const struct __locale_struct __c_locale = { 0 };
+const struct __locale_struct __c_dot_utf8_locale = {
+	.cat[LC_CTYPE] = &__c_dot_utf8
+};