decrease paddign: gcc-9.3.1 slaps 32-byte alignment on arrays willy-nilly

text	   data	    bss	    dec	    hex	filename
1021988	    559	   5052	1027599	  fae0f	busybox_old
1021236	    559	   5052	1026847	  fab1f	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

include/platform.h

@@ -342,6 +342,8 @@ typedef unsigned smalluint;
 # define ALIGN2
 # define ALIGN4
 #endif
+#define ALIGN8     __attribute__((aligned(8)))
+#define ALIGN_PTR  __attribute__((aligned(sizeof(void*))))
 
 /*
  * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.