PPC: Add build rules for PPC interpreter (non-functional, yet).

src/lj_arch.h

@@ -147,6 +147,20 @@
 
 #elif LUAJIT_TARGET == LUAJIT_ARCH_PPC
 
+#define LJ_ARCH_NAME		"ppc"
+#define LJ_ARCH_BITS		32
+#define LJ_ARCH_ENDIAN		LUAJIT_BE
+#define LJ_ARCH_HASFPU		1
+#define LJ_TARGET_PPC		1
+#define LJ_TARGET_EHRETREG	3
+#define LJ_TARGET_JUMPRANGE	25	/* +-2^25 = +-32MB */
+#define LJ_TARGET_MASKSHIFT	0
+#define LJ_TARGET_MASKROT	1
+#define LJ_TARGET_UNIFYROT	1	/* Want only IR_BROL. */
+#define LJ_ARCH_DUALNUM		1
+#define LJ_ARCH_NOFFI		1	/* NYI: comparisons, calls. */
+#define LJ_ARCH_NOJIT		1
+
 #error "No support for plain PowerPC CPUs (yet)"
 
 #elif LUAJIT_TARGET == LUAJIT_ARCH_PPCSPE