Fix syntax of endianness conditional

kernel/power/KERNEL.PPC440

@@ -15,7 +15,7 @@ ZASUMKERNEL	= zasum_ppc440.S
 
 SAXPYKERNEL	=  axpy_ppc440.S
 DAXPYKERNEL	=  axpy_ppc440.S
-ifneq ($(__BYTE_ORDER__),$(__ORDER_BIG_ENDIAN__))
+ifneq ($(__BYTE_ORDER__),"__ORDER_BIG_ENDIAN__")
 CAXPYKERNEL	= ../arm/zaxpy.c
 ZAXPYKERNEL	= ../arm/zaxpy.c
 else
@@ -25,7 +25,7 @@ endif
 
 SDOTKERNEL	=  dot_ppc440.S
 DDOTKERNEL	=  dot_ppc440.S
-ifneq ($(__BYTE_ORDER__),$(__ORDER_BIG_ENDIAN__))
+ifneq ($(__BYTE_ORDER__),"__ORDER_BIG_ENDIAN__")
 CDOTKERNEL	= zdot_ppc440.S
 ZDOTKERNEL	= zdot_ppc440.S
 else
@@ -62,7 +62,7 @@ ZNRM2KERNEL	= znrm2_ppc440.S
 
 SROTKERNEL	=  rot_ppc440.S
 DROTKERNEL	=  rot_ppc440.S
-ifneq ($(__BYTE_ORDER__),$(__ORDER_BIG_ENDIAN__))
+ifneq ($(__BYTE_ORDER__),"__ORDER_BIG_ENDIAN__")
 CROTKERNEL	= zrot_ppc440.S
 ZROTKERNEL	= zrot_ppc440.S
 else
@@ -132,7 +132,7 @@ ZTRSMKERNEL_LT	=  ztrsm_kernel_ppc440_LT.S
 ZTRSMKERNEL_RN	=  ztrsm_kernel_ppc440_LT.S
 ZTRSMKERNEL_RT	=  ztrsm_kernel_ppc440_RT.S
 
-ifeq ($(__BYTE_ORDER__),$(__ORDER_BIG_ENDIAN__))
+ifeq ($(__BYTE_ORDER__),"__ORDER_BIG_ENDIAN__")
 SGEMVNKERNEL = ../arm/gemv_n.c
 DGEMVNKERNEL = ../arm/gemv_n.c
 SGEMVTKERNEL = ../arm/gemv_t.c