Fix duplicate endif and collateral damage

Makefile.system

@@ -263,6 +263,7 @@ ifeq ($(ARCH), x86_64)
 SMALL_MATRIX_OPT = 1
 else ifeq ($(ARCH), power)
 SMALL_MATRIX_OPT = 1
+BUILD_BFLOAT16 = 1
 endif
 ifeq ($(SMALL_MATRIX_OPT), 1)
 CCOMMON_OPT += -DSMALL_MATRIX_OPT
@@ -679,6 +680,10 @@ ifeq ($(ARCH), mips64)
 DYNAMIC_CORE = LOONGSON3R3 LOONGSON3R4
 endif
 
+ifeq ($(ARCH), loongarch64)
+DYNAMIC_CORE = LOONGSON3R5 LOONGSON2K1000 LOONGSONGENERIC
+endif
+
 ifeq ($(ARCH), zarch)
 DYNAMIC_CORE = ZARCH_GENERIC
 
@@ -1571,7 +1576,6 @@ ifeq ($(F_COMPILER),CRAY)
 LAPACK_FFLAGS := $(filter-out -msse3 -mssse3 -msse4.1 -mavx -mavx2 -mskylake-avx512 ,$(FFLAGS))
 FFLAGS := $(filter-out -msse3 -mssse3 -msse4.1 -mavx -mavx2 -mskylake-avx512 ,$(FFLAGS))
 endif
-endif
 
 LAPACK_CFLAGS = $(CFLAGS)
 LAPACK_CFLAGS += -DHAVE_LAPACK_CONFIG_H