Add line breaks to some long commands (#39)

Author: mohanson

ckb-vm-test-suite/programs/contracts/secp256k1_ecdsa/Makefile

@@ -38,7 +38,9 @@ endif
 
 default: build test
 
-CFLAGS_CKBVM_BASE = --target=riscv64-unknown-elf -march=rv64imc_zba_zbb_zbc_zbs $(CLANG_OPTIMIZER) -fdata-sections -ffunction-sections
+CFLAGS_CKBVM_BASE = --target=riscv64-unknown-elf -march=rv64imc_zba_zbb_zbc_zbs \
+	$(CLANG_OPTIMIZER) \
+	-fdata-sections -ffunction-sections
 CFLAGS_CKBVM_SECP256K1 = $(CFLAGS_CKBVM_BASE) \
 	-isystem musl/release/include \
 	-DECMULT_WINDOW_SIZE=6 -DENABLE_MODULE_RECOVERY

ckb-vm-test-suite/programs/contracts/secp256k1_schnorr/Makefile

@@ -38,7 +38,9 @@ endif
 
 default: build test
 
-CFLAGS_CKBVM_BASE = --target=riscv64-unknown-elf -march=rv64imc_zba_zbb_zbc_zbs $(CLANG_OPTIMIZER) -fdata-sections -ffunction-sections
+CFLAGS_CKBVM_BASE = --target=riscv64-unknown-elf -march=rv64imc_zba_zbb_zbc_zbs \
+	$(CLANG_OPTIMIZER) \
+	-fdata-sections -ffunction-sections
 CFLAGS_CKBVM_SECP256K1 = $(CFLAGS_CKBVM_BASE) \
 	-isystem musl/release/include \
 	-DECMULT_WINDOW_SIZE=6 -DENABLE_MODULE_RECOVERY -DENABLE_MODULE_SCHNORRSIG -DENABLE_MODULE_EXTRAKEYS

ckb-vm-test-suite/programs/contracts/sphincsplus_ref/Makefile

@@ -69,7 +69,9 @@ ifneq (,$(findstring sha2,$(SPHINCSPLUS_PARAMS)))
 		$(SPHINCSPLUS_DIR)/thash_sha2_$(SPHINCSPLUS_THASH).c
 endif
 
-CFLAGS_CKBVM_BASE = --target=riscv64-unknown-elf -march=rv64imc_zba_zbb_zbc_zbs $(CLANG_OPTIMIZER) -fdata-sections -ffunction-sections
+CFLAGS_CKBVM_BASE = --target=riscv64-unknown-elf -march=rv64imc_zba_zbb_zbc_zbs \
+	$(CLANG_OPTIMIZER) \
+	-fdata-sections -ffunction-sections
 CFLAGS_CKBVM_SPHINCSPLUS = $(CFLAGS_CKBVM_BASE) \
 	-isystem musl/release/include \
 	-I sphincsplus/ref \