Allocate .sbss and .common into .bss

GNU ld fragments .bss into .sbss and .common (see man nm(1) for further
reference). However, the linker script used by PSXSDK did not determine where
to put such sections, causing some statically allocated objects to be placed
**after** __bss_end, leading to undefined behaviour.

misc/genscripts.sh

@@ -50,6 +50,13 @@ SECTIONS
 	.bss  ALIGN(4) :
 	{
 		*(.bss)
+		*(.bss.*)
+		*(.gnu.linkonce.b.*)
+		*(COMMON)
+		*(.sbss)
+		*(.sbss.*)
+		*(.gnu.linkonce.sb.*)
+		*(.scommon)
 	}
 
 	__text_start = ADDR(.text);