fix yocto linux flutter gtk issue

gistfile1.txt

root@apalis-imx8-07307228:~# ln -s /usr/lib/pkgconfig/egl.pc /usr/lib/pkgconfig/gl.pc
root@apalis-imx8-07307228:~# pkg-config --cflags --libs gtk+-3.0
-DLINUX -DWL_EGL_PLATFORM -DLINUX -DWL_EGL_PLATFORM -pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/harfbuzz -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 -lharfbuzz -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0
root@apalis-imx8-07307228:~# 
root@apalis-imx8-07307228:~# pkg-config --cflags --libs gl
-DLINUX -DWL_EGL_PLATFORM -lEGL
root@apalis-imx8-07307228:~#