KERNEL.PPC970, KERNEL.PPCG4: unbreak CMake parsing

Fixes: https://github.com/OpenMathLib/OpenBLAS/issues/4366

kernel/power/KERNEL.PPC970

@@ -1,11 +1,11 @@
 ifeq ($(__BYTE_ORDER__),__ORDER_BIG_ENDIAN__)
 SGEMMKERNEL    =  gemm_kernel.S
-SGEMMINCOPY    =  
-SGEMMITCOPY    =  
+SGEMMINCOPY    =
+SGEMMITCOPY    =
 SGEMMONCOPY    =  ../generic/gemm_ncopy_4.c
 SGEMMOTCOPY    =  ../generic/gemm_tcopy_4.c
-SGEMMINCOPYOBJ =  
-SGEMMITCOPYOBJ =  
+SGEMMINCOPYOBJ =
+SGEMMITCOPYOBJ =
 SGEMMONCOPYOBJ =  sgemm_oncopy$(TSUFFIX).$(SUFFIX)
 SGEMMOTCOPYOBJ =  sgemm_otcopy$(TSUFFIX).$(SUFFIX)
 else

kernel/power/KERNEL.PPCG4

@@ -96,9 +96,9 @@ CGEMMINCOPY    =
 CGEMMONCOPY    =
 CGEMMONCOPY    =  ../generic/zgemm_ncopy_2.c
 CGEMMOTCOPY    =  ../generic/zgemm_tcopy_2.c
-CGEMMINCOPYOBJ =  
+CGEMMINCOPYOBJ =
 #cgemm_incopy$(TSUFFIX).$(SUFFIX)
-CGEMMITCOPYOBJ =  
+CGEMMITCOPYOBJ =
 #cgemm_itcopy$(TSUFFIX).$(SUFFIX)
 CGEMMONCOPYOBJ =  cgemm_oncopy$(TSUFFIX).$(SUFFIX)
 CGEMMOTCOPYOBJ =  cgemm_otcopy$(TSUFFIX).$(SUFFIX)