egl/opengl: remove duplicate LDFLAGS

Fix autoreconf warning due to duplicate LDFLAGS:

    src/egl/opengl/Makefile.am:82: warning: eglgears_x11_LDFLAGS multiply defined in condition TRUE ...
    src/egl/opengl/Makefile.am:71: ... 'eglgears_x11_LDFLAGS' previously defined here
    src/egl/opengl/Makefile.am:83: warning: egltri_x11_LDFLAGS multiply defined in condition TRUE ...
    src/egl/opengl/Makefile.am:72: ... 'egltri_x11_LDFLAGS' previously defined here

Both LDFLAGS variables are defined to `$(AM_LDFLAGS) $(X11_LIBS)` in
both definitions, so either should be safe to remove.

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
3 jobs for automake-dup-ldflags in 4 minutes and 1 second (queued for 14 seconds)
latest
Status Job ID Name Coverage
  Container
passed #5858421
x86_build

00:01:41

 
  Build
passed #5858423
autotools

00:02:19

passed #5858422
cmake

00:00:58