[gobject-introspection] Do not require the precense of INTROSPECTION_GIRS

[Johan Dahlin <johan src gnome org>]

commit c3ba50927516a34d913c02ca606b2f7718d60bd7
Author: Johan Dahlin <johan gnome org>
Date:   Mon Dec 14 21:44:26 2009 -0200

    Do not require the precense of INTROSPECTION_GIRS
    
    It's useful to be able to include the makefile without
    having introspection enabled.

 Makefile.introspection |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.introspection b/Makefile.introspection
index 582bf84..980d982 100644
--- a/Makefile.introspection
+++ b/Makefile.introspection
@@ -37,7 +37,6 @@
 
 # Make sure the required variables are set, these should under normal
 # circumstances come from introspection.m4
-$(if $(INTROSPECTION_GIRS),,$(error Need to define INTROSPECTION_GIRS))
 $(if $(INTROSPECTION_SCANNER),,$(error Need to define INTROSPECTION_SCANNER))
 $(if $(INTROSPECTION_COMPILER),,$(error Need to define INTROSPECTION_COMPILER))