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

fusl/src/env/getenv.c

Index: fusl/src/env/getenv.c
diff --git a/fusl/src/env/getenv.c b/fusl/src/env/getenv.c
new file mode 100644
index 0000000000000000000000000000000000000000..00c1bce03725bf51c077cf6334d826105f5ad12e
--- /dev/null
+++ b/fusl/src/env/getenv.c
@@ -0,0 +1,14 @@
+#include <stdlib.h>
+#include <string.h>
+#include "libc.h"
+
+char *getenv(const char *name)
+{
+	int i;
+	size_t l = strlen(name);
+	if (!__environ || !*name || strchr(name, '=')) return NULL;
+	for (i=0; __environ[i] && (strncmp(name, __environ[i], l)
+		|| __environ[i][l] != '='); i++);
+	if (__environ[i]) return __environ[i] + l+1;
+	return NULL;
+}