[cairo] PATCH - libpixman fails to install all needed headers

[John Ellson]

At least slim_import.h needs to be installed as it is included by 
pixman.h and results in a
cairo build failure if not installed.

This might install too much, but it works.

John



Index: src/Makefile.am
===================================================================
RCS file: /cvs/cairo/libpixman/src/Makefile.am,v
retrieving revision 1.3
diff -r1.3 Makefile.am
2c2
< include_HEADERS = pixman.h
---
 > include_HEADERS = pixman.h slim_export.h slim_import.h slim_internal.h
24,27c24
<       icutil.c \
<       slim_export.h \
<       slim_import.h \
<       slim_internal.h
---
 >       icutil.c