Makefile: fix installheaders

[fufexan]

Describe your PR, what does it fix/add?

Attempts to fix the recent breakage of make installheaders, which breaks
hyprpm.

Is there anything you want to mention? (unchecked code, possible bugs, found problems, breaking compatibility, etc.)

Untested. Please test.

Is it ready for merging, or does it need work?

Needs testing.

Closes #5896.

[LOSEARDES77]

Tested and worked for me

[paulhaider]

tested but does not seem to fix it for me!

hyprpm output on 6ae4278 : hyprpm_5929.txt

(for comparison: hyprpm output on latest commit 70b5e6d : hyprpm_latest.txt)

[thamwangjun]

@fufexan The issue is not fixed for me as well, on arch:

Build targets in project: 136

wlroots 0.18.0-dev

    drm-backend     : YES
    x11-backend     : YES
    libinput-backend: YES
    xwayland        : YES
    gles2-renderer  : YES
    vulkan-renderer : NO
    gbm-allocator   : YES
    session         : YES
    xcb-errors      : YES
    egl             : YES
    libliftoff      : YES

  User defined options
    examples        : false
    renderers       : gles2

Found ninja-1.12.0 at /usr/bin/ninja
                                                 
✔ configured Hyprland                                                                                                                                                                                     
[v] installation will run: sed -i -e "s#PREFIX = /usr/local#PREFIX = /home/thamw/.local/share/hyprpm/headersRoot#" /tmp/hyprpm/hyprland-thamw/Makefile && cd /tmp/hyprpm/hyprland-thamw && make installheaders
 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╍━━━━━━━━━  4 / 5  Installing sources[v] installer returned: rm -fr /home/thamw/.local/share/hyprpm/headersRoot/include/hyprland                                 
mkdir -p /home/thamw/.local/share/hyprpm/headersRoot/include/hyprland
mkdir -p /home/thamw/.local/share/hyprpm/headersRoot/include/hyprland/protocols
mkdir -p /home/thamw/.local/share/hyprpm/headersRoot/include/hyprland/wlroots-hyprland
mkdir -p /home/thamw/.local/share/hyprpm/headersRoot/share/pkgconfig
find src -name '*.h*' -print0 | cpio --quiet -0dump /home/thamw/.local/share/hyprpm/headersRoot/include/hyprland
cd subprojects/wlroots-hyprland/include && find . -name '*.h*' -print0 | cpio --quiet -0dump /home/thamw/.local/share/hyprpm/headersRoot/include/hyprland/wlroots-hyprland && cd ../../..
cd subprojects/wlroots-hyprland/build/include && find . -name '*.h*' -print0 | cpio --quiet -0dump /home/thamw/.local/share/hyprpm/headersRoot/include/hyprland/wlroots-hyprland && cd ../../../..
cp ./protocols/*.h /home/thamw/.local/share/hyprpm/headersRoot/include/hyprland/protocols
cp ./protocols/*.hpp /home/thamw/.local/share/hyprpm/headersRoot/include/hyprland/protocols
cp ./build/hyprland.pc /home/thamw/.local/share/hyprpm/headersRoot/share/pkgconfig
if [ -d /usr/share/pkgconfig ]; then cp ./build/hyprland.pc /usr/share/pkgconfig 2>/dev/null || true; fi
chmod -R 755 /home/thamw/.local/share/hyprpm/headersRoot/include/hyprland
chmod 755 /home/thamw/.local/share/hyprpm/headersRoot/share/pkgconfig

✖ failed to install headers with error code 2                                                                                                                                                             
 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━  5 / 5  Failed               

Let me know if you need more details on debugging this.

[vaxerski]

#5946