[libc] C style static_assert takes two arguments

Fix this up and fix up the one existening dependency on the
existing incorrect behaviour.

lib/libc/include/assert.h

@@ -24,6 +24,6 @@
 #define assert(e) DEBUG_ASSERT(e)
 
 #ifndef __cplusplus
-#define static_assert(e) STATIC_ASSERT(e)
+#define static_assert(e,r) _Static_assert(e, r)
 #endif
 

platform/lpc43xx/udc.c

@@ -18,8 +18,8 @@
 #include <kernel/spinlock.h>
 
 #include <platform/lpc43xx-usb.h>
-static_assert(sizeof(usb_dqh_t) == 64);
-static_assert(sizeof(usb_dtd_t) == 32);
+static_assert(sizeof(usb_dqh_t) == 64, "");
+static_assert(sizeof(usb_dtd_t) == 32, "");
 
 #include <dev/udc.h>