sys-power: Get rid of unfinished ACPICA port.

This lives in the Haiku tree, as it's part of our ACPI driver.

sys-power/iasl/patches/acpica-haiku.diff

@@ -1,31 +0,0 @@
-Index: compiler/Makefile
-===================================================================
---- compiler/Makefile	(revision 41258)
-+++ compiler/Makefile	(working copy)
-@@ -12,7 +12,7 @@
- ACPICA_OSL =    $(ACPICA_SRC)/os_specific/service_layers
- 
- NOMAN=	YES
--CFLAGS+= -Wall -O2 -Wstrict-prototypes -D_LINUX -DACPI_ASL_COMPILER -I../include -I../compiler
-+CFLAGS+= -Wall -O2 -Wstrict-prototypes -DACPI_ASL_COMPILER -I../include -I../compiler
- 
- #
- # Bison/Flex configuration
-@@ -25,9 +25,16 @@
- 
- 
- COMPILE = $(CC) -c $(CFLAGS) -o$@ $?
-+
-+OS ?= Linux
-+ifeq ($(OS),Linux)
-+CFLAGS += -D_LINUX
- LDFLAGS += -lpthread -lrt
-+endif
-+ifeq ($(OS),Haiku)
-+CFLAGS += -D_LINUX
-+endif
- 
--
- OBJS = \
- 	adfile.o \
- 	adisasm.o \