[babl] babl: revert and clarify libtool flag for win32 builds

[Øyvind Kolås <ok src gnome org>]

commit fd20f53028213b6e79024f7593d71b9374408e10
Author: Edward E <develinthedetail gmail com>
Date:   Sat Sep 30 14:32:49 2017 -0500

    babl: revert and clarify libtool flag for win32 builds

 babl/Makefile.am |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/babl/Makefile.am b/babl/Makefile.am
index 6caa929..98b822b 100644
--- a/babl/Makefile.am
+++ b/babl/Makefile.am
@@ -1,7 +1,7 @@
 ## Source directory
 
 if PLATFORM_WIN32
-no_undefined = -no-undefined
+win32_no_undefined = -no-undefined
 endif
 
 SUBDIRS = base
@@ -102,6 +102,7 @@ libbabl_la_LDFLAGS=                 \
        $(MATH_LIB) $(THREAD_LIB) $(LOG_LIB)
 
 libbabl_@BABL_API_VERSION@_la_LDFLAGS=                 \
+       ${win32_no_undefined}                           \
        $(MATH_LIB) $(THREAD_LIB) $(LOG_LIB)            \
        -export-symbols $(top_srcdir)/export-symbols    \
        -version-info $(BABL_LIBRARY_VERSION)