fix: incorrect usage of Makefile since #1416

[yangby-cryptape]

What this PR does / why we need it?

This PR fix an incorrect usage of Makefile introduced since #1416.

The target-specific variable values are not applied in the environment directly, they have to be passed via a explicit set, except the variables which used in built-in target rules.

👉 A simple example to explain this rule and the exception. (useful)

• A simple Makefile:

  aaa:
          @true && WIIL_BE_SET="$(WIIL_BE_SET)" ./check-env
  
  bbb: WIIL_BE_SET=true
  bbb: WONT_BE_SET=true
  bbb: aaa
  
  # The variables which used in built-in target rules don't require a explicit set.
  # When users execute `make build`, `CFLAGS = -g` will be applied.
  a.o: a.c
  build: CFLAGS = -g
  build: a.o
  clean:
          rm *.o

• A simple bash script check-env:

  #!/usr/bin/env bash
  
  echo "will_be_set = [${WIIL_BE_SET}]"
  echo "wont_be_set = [${WONT_BE_SET}]"

• The result of tests:

  > make aaa
  will_be_set = []
  wont_be_set = []
  > make bbb
  will_be_set = [true]
  wont_be_set = []
  > make clean a.o
  cc    -c -o a.o a.c
  > make clean build
  cc -g    -c -o a.o a.c
  

References:

• GNU Makefile Docs: 6.11 Target-specific Variable Values

What is the impact of this PR?

No Breaking Change

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• OCT 1-5 And 12-15
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• OCT 16-19
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CI Description

CI Name	Description
Chaos CI	Test the liveness and robustness of Axon under terrible network condition
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OCT 1-5 | 6-10 | 11 | 12-15 | 16-19	Run the compatibility tests provided by OpenZeppelin

[github-actions]

CI tests run on commit:

• commit id: 5919cf5

CI test list:

• E2E Tests
• OCT 1-5 And 12-15
• OCT 6-10
• OCT 11
• OCT 16-19
• v3 Core Tests
• Web3 Compatible Tests

Please check ci test results later.