Replaced builtin macro packages with .mac files that are included like ordinary .inc files.

The benefits are:
- Independency of ca65 build from perl
- More transparent behaviour

asminc/generic.mac

@@ -0,0 +1,45 @@
+
+; add - Add without carry
+.macro  add     Arg1, Arg2
+        clc
+        .if .paramcount = 2
+                adc     Arg1, Arg2
+        .else
+                adc     Arg1
+        .endif
+.endmacro
+
+; sub - subtract without borrow
+.macro  sub     Arg1, Arg2
+        sec
+        .if .paramcount = 2
+                sbc     Arg1, Arg2
+        .else
+                sbc     Arg1
+        .endif
+.endmacro
+
+; bge - jump if unsigned greater or equal
+.macro  bge     Arg
+        bcs     Arg
+.endmacro
+
+; blt - Jump if unsigned less
+.macro  blt     Arg
+        bcc     Arg
+.endmacro
+
+; bgt - jump if unsigned greater
+.macro  bgt     Arg
+        .local  L
+        beq     L
+        bcs     Arg
+L:
+.endmacro
+
+; ble - jump if unsigned less or equal
+.macro  ble     Arg
+        beq     Arg
+        bcc     Arg
+.endmacro
+