configure: drop --with-egl-driver-dir switch

The location of the egl driver(s) is matter that we should have
never exposed to the user. Currently the dri2 driver is built
into the libEGL loader, with the gallium based one soon to follow.

v2: Fold EGL_DRIVER_INSTALL_DIR within the makefiles. Suggested by Matt.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80615
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>

configure.ac

@@ -1594,13 +1594,6 @@ if ! echo "$egl_platforms" | grep -q 'x11'; then
     GL_PC_CFLAGS="$GL_PC_CFLAGS -DMESA_EGL_NO_X11_HEADERS"
 fi
 
-AC_ARG_WITH([egl-driver-dir],
-    [AS_HELP_STRING([--with-egl-driver-dir=DIR],
-                    [directory for EGL drivers @<:@default=${libdir}/egl@:>@])],
-    [EGL_DRIVER_INSTALL_DIR="$withval"],
-    [EGL_DRIVER_INSTALL_DIR='${libdir}/egl'])
-AC_SUBST([EGL_DRIVER_INSTALL_DIR])
-
 AC_ARG_WITH([max-width],
     [AS_HELP_STRING([--with-max-width=N],
                     [Maximum framebuffer width (4096)])],

src/egl/main/Makefile.am

@@ -28,7 +28,7 @@ AM_CFLAGS = \
 	$(VISIBILITY_CFLAGS) \
 	$(EGL_CFLAGS) \
 	-D_EGL_NATIVE_PLATFORM=$(EGL_NATIVE_PLATFORM) \
-	-D_EGL_DRIVER_SEARCH_DIR=\"$(EGL_DRIVER_INSTALL_DIR)\" \
+	-D_EGL_DRIVER_SEARCH_DIR=\"$(libdir)/egl\" \
 	-D_EGL_OS_UNIX=1
 
 lib_LTLIBRARIES = libEGL.la

src/gallium/targets/egl-static/Makefile.am

@@ -52,7 +52,7 @@ AM_LDFLAGS += \
 	-Wl,--version-script=$(top_srcdir)/src/gallium/targets/egl-static/egl.sym
 endif
 
-egldir = $(EGL_DRIVER_INSTALL_DIR)
+egldir = $(libdir)/egl
 egl_LTLIBRARIES = egl_gallium.la
 
 nodist_EXTRA_egl_gallium_la_SOURCES = dummy.cpp