configure: Add pixman-1 to the compositor required packages
We used to get it through the IMAGE_LIBS/CFLAGS but we use it directly
in the compositor to add it as a direct dependency.
diff --git a/configure.ac b/configure.ac
index f8ee2fa..f207c3c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,7 +25,7 @@
AC_SUBST(DLOPEN_LIBS)
PKG_CHECK_MODULES(COMPOSITOR,
- [wayland-server egl >= 7.10 glesv2 xkbcommon])
+ [wayland-server egl >= 7.10 glesv2 xkbcommon pixman-1])
AC_CHECK_PROG(RSVG_CONVERT, rsvg-convert, rsvg-convert)
AM_CONDITIONAL(HAVE_RSVG_CONVERT, test -n "$RSVG_CONVERT")