Fix: Check if Arch and Use correct GStreamer paths for Arch Linux

[Aram-Vn]

Fix: Correct GStreamer Paths for Arch Linux in FindGStreamer.cmake

Description

QGroundControl’s FindGStreamer.cmake assumes a Debian-based library path structure (/usr/lib/x86_64-linux-gnu/). This causes build failures on Arch Linux, where libraries are located in /usr/lib/ instead.

This PR:

• Dynamically detects Arch Linux using /etc/os-release.
• Sets PKG_CONFIG_PATH and GSTREAMER_LIB_PATH correctly for Arch (/usr/lib/).
• Preserves Debian-based paths for Ubuntu, Debian, etc.
• Ensures QGroundControl builds successfully on Arch Linux

Test Steps

To Reproduce the Original Issue (Before Fix):

1. Clone the QGroundControl repository on Arch Linux.
2. run

cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug
cmake --build build --config Debug
./build/Debug/QGroundControl      

Checklist:

• Review Contribution Guidelines.
• Review Code of Conduct.
• I have tested my changes.

Related Issue

N/A (first report)

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[HTRamsey]

Probably need to rebase because I cleaned up that file a bit more yesterday

[Aram-Vn]

Probably need to rebase because I cleaned up that file a bit more yesterday

Thanks, that worked!

[HTRamsey]

Did my method solve your problem? Trying to avoid manually listing distributions

[Aram-Vn]

Did my method solve your problem? Trying to avoid manually listing distributions

same problem
i did git pull --rebase

[Aram-Vn]

Did my method solve your problem? Trying to avoid manually listing distributions

and other problem

find_program(QMAKE_EXECUTABLE NAMES qmake HINTS ${QT_ROOT_DIR} ${QTDIR} ENV QTDIR PATH_SUFFIXES bin)
execute_process(COMMAND ${QMAKE_EXECUTABLE} -query QT_VERSION OUTPUT_VARIABLE QT_VERSION)
if(QT_VERSION LESS QT_MINIMUM_VERSION)
    MESSAGE(FATAL_ERROR "Minimum supported Qt version: ${QT_MINIMUM_VERSION}.
    Installed version: ${QT_VERSION}")
endif()

include(Qt6QGCConfiguration)

this didnt work well

i have both wersion but it sees 5.15.16