pipenv install -r requirements.txt not respecting sys_platform

[777aker]

Issue description

sys_platform not working in requirements.txt. It is ignoring the sys_platform flag and putting packages in regardless of platform.

Expected result

python-magic-bin; sys_platform == 'win32' should produce a pipfile that looks something like python-magic-bin = {version = "*", markers = "sys_platform == 'win32'"}

Actual result

Pipfile shows python-magic-bin = "*"

### Steps to replicate
file requirements.txt 
---
-r requirements-compliance.txt
---

file requirements-compliance.txt
---
python-magic-bin; sys_platform == 'win32'
---

command
---
pipenv install -r requirements.txt
---

---

$ pipenv --support

Pipenv version: '2023.3.20'

Pipenv location: '/pyenv/versions/3.11.5/lib/python3.11/site-packages/pipenv'

Python location: '/pyenv/versions/3.11.5/bin/python3.11'

OS Name: 'posix'

User pip version: '23.0.1'

user Python installations found:

• 3.11.5: /pyenv/versions/3.11.5/bin/python3
• 3.11.5: /pyenv/versions/3.11.5/bin/python
• 3.11.5: /pyenv/versions/3.11.5/bin/python3
• 3.10.12: /usr/bin/python3
• 3.10.12: /bin/python3
• 3.7.17: /pyenv/versions/3.7.17/bin/python3.7

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '3.11.5',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '6.5.0-21-generic',
 'platform_system': 'Linux',
 'platform_version': '#21~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Fri Feb  9 '
                     '13:32:52 UTC 2',
 'python_full_version': '3.11.5',
 'python_version': '3.11',
 'sys_platform': 'linux'}

System environment variables:

• SHELL
• SESSION_MANAGER
• QT_ACCESSIBILITY
• PIPENV_VENV_IN_PROJECT
• COLORTERM
• PYENV_SHELL
• XDG_CONFIG_DIRS
• SSH_AGENT_LAUNCHER
• XDG_MENU_PREFIX
• TERM_PROGRAM_VERSION
• GNOME_DESKTOP_SESSION_ID
• GNOME_SHELL_SESSION_MODE
• SSH_AUTH_SOCK
• XMODIFIERS
• DESKTOP_SESSION
• NO_AT_BRIDGE
• EDITOR
• GTK_MODULES
• PWD
• KRB5CCNAME
• XDG_SESSION_DESKTOP
• LOGNAME
• XDG_SESSION_TYPE
• SYSTEMD_EXEC_PID
• XAUTHORITY
• VSCODE_GIT_ASKPASS_NODE
• HOME
• USERNAME
• IM_CONFIG_PHASE
• LANG
• LS_COLORS
• XDG_CURRENT_DESKTOP
• VTE_VERSION
• WAYLAND_DISPLAY
• GIT_ASKPASS
• GNOME_TERMINAL_SCREEN
• CHROME_DESKTOP
• VSCODE_GIT_ASKPASS_EXTRA_ARGS
• GNOME_SETUP_DISPLAY
• LESSCLOSE
• XDG_SESSION_CLASS
• TERM
• LESSOPEN
• USER
• VSCODE_GIT_IPC_HANDLE
• GNOME_TERMINAL_SERVICE
• DISPLAY
• SHLVL
• QT_IM_MODULE
• XDG_RUNTIME_DIR
• PYENV_ROOT
• VSCODE_GIT_ASKPASS_MAIN
• XDG_DATA_DIRS
• GDK_BACKEND
• PATH
• GDMSESSION
• ORIGINAL_XDG_CURRENT_DESKTOP
• DBUS_SESSION_BUS_ADDRESS
• PIPENV_TEST_INDEX
• OLDPWD
• GOPATH
• TERM_PROGRAM
• _
• PIP_DISABLE_PIP_VERSION_CHECK
• PIP_PYTHON_PATH
• PYTHONDONTWRITEBYTECODE
• PYTHONFINDER_IGNORE_UNSUPPORTED

Pipenv–specific environment variables:

• PIPENV_VENV_IN_PROJECT: 1
• PIPENV_TEST_INDEX: https://pypi.firstrf.com/simple

Debug–specific environment variables:

• PATH: /pyenv/versions/3.11.5/bin:/pyenv/shims:/pyenv/bin:/home/mkelley/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin:/usr/local/go/bin:/home/mkelley/go/bin:/home/mkelley/.local/bin:/usr/local/go/bin:/home/mkelley/go/bin:/home/mkelley/.local/bin
• SHELL: /bin/bash
• EDITOR: /usr/bin/vim
• LANG: en_US.UTF-8
• PWD: /home/mkelley/Desktop/piperror

---

Contents of Pipfile ('/home/mkelley/Desktop/piperror/Pipfile'):

[[source]]
url = "https://pypi.firstrf.com/simple"
verify_ssl = true
name = "pip_conf_index_global"

[packages]
python-magic-bin = "*"

[dev-packages]

[requires]
python_version = "3.7"