ci: remove CentOS 7 specific hack from CI build

Author: ntamas

.github/workflows/build.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Build wheels (manylinux)
         uses: pypa/[email protected]
         env:
-          CIBW_BEFORE_BUILD: "bash scripts/fixup_centos_7_in_ci.sh && yum install -y flex bison libxml2-devel zlib-devel cairo-devel && pip install -U cmake pip setuptools wheel && python setup.py build_c_core"
+          CIBW_BEFORE_BUILD: "yum install -y flex bison libxml2-devel zlib-devel cairo-devel && pip install -U cmake pip setuptools wheel && python setup.py build_c_core"
           CIBW_BUILD: "*-manylinux_${{ matrix.wheel_arch }}"
           # Skip tests for Python 3.10 onwards because SciPy does not have
           # 32-bit wheels for Linux
@@ -66,7 +66,7 @@ jobs:
       - name: Build wheels (manylinux)
         uses: pypa/[email protected]
         env:
-          CIBW_BEFORE_BUILD: "bash scripts/fixup_centos_7_in_ci.sh && yum install -y flex bison libxml2-devel zlib-devel cairo-devel && pip install -U cmake pip setuptools wheel && python setup.py build_c_core"
+          CIBW_BEFORE_BUILD: "yum install -y flex bison libxml2-devel zlib-devel cairo-devel && pip install -U cmake pip setuptools wheel && python setup.py build_c_core"
           CIBW_ARCHS_LINUX: aarch64
           CIBW_BUILD: "*-manylinux_aarch64"