build: Skip GLESv1 tests if there's no GLESv1

It's pretty much pointless to build and run tests for a library that we
know is not available.

The Meson build already skips the GLES 1.0 test, so let's make the
Autotools build do the same.

configure.ac

@@ -119,6 +119,9 @@ fi
 
 AM_CONDITIONAL(HAS_ZNOW, test x$has_znow = xyes)
 
+AC_CHECK_LIB([GLESv1_CM], [glFlush], [has_gles1=yes], [has_gles1=no])
+AM_CONDITIONAL(HAS_GLES1, test x$has_gles1 = xyes)
+
 AC_CHECK_LIB([dl], [dlopen], [DLOPEN_LIBS="-ldl"])
 AC_SUBST([DLOPEN_LIBS])
 

test/Makefile.am

@@ -74,10 +74,13 @@ if BUILD_EGL
 EGL_TESTS = \
 	egl_has_extension_nocontext \
 	egl_gl \
-	egl_gles1_without_glx \
 	egl_gles2_without_glx \
 	$()
 
+if HAS_GLES1
+EGL_TESTS += egl_gles1_without_glx
+endif
+
 EGL_UTIL_LIB = libegl_common.la
 endif