mesa: enable remap table when --enable-shared-glapi

As libGL will use libglapi for function lookups, we need to enable the remap
table.

Tested-by: Brian Paul <brianp@vmware.com>
Tested-by: Matt Turner <mattst88@gmail.com>
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=45660
diff --git a/configure.ac b/configure.ac
index b2b1ab8..846b623 100644
--- a/configure.ac
+++ b/configure.ac
@@ -698,6 +698,9 @@
 SHARED_GLAPI="0"
 if test "x$enable_shared_glapi" = xyes; then
     SHARED_GLAPI="1"
+    # libGL will use libglapi for function lookups (IN_DRI_DRIVER means to use
+    # the remap table)
+    DEFINES="$DEFINES -DIN_DRI_DRIVER"
 fi
 AC_SUBST([SHARED_GLAPI])