Add GSL_LIBS to W32_PLUGIN_LIBS

Necessary for plugins to link properly when building
with --enable-gsl

Author: daviesrob

config.mk.in

@@ -61,10 +61,10 @@ PLUGIN_EXT = @PLUGIN_EXT@
 @Hsource@HTSLIB_LIB = $(HTSLIB) $(HTSLIB_static_LIBS)
 @Hsource@HTSLIB_DLL = $(HTSDIR)/@HTSLIB_DLL@
 @Hsource@HTSLIB_LDFLAGS = $(HTSLIB_static_LDFLAGS)
-@Hsource@W32_PLUGIN_LIBS = libbcftools.a $(HTSLIB_DLL) $(ALL_LIBS)
+@Hsource@W32_PLUGIN_LIBS = libbcftools.a $(HTSLIB_DLL) $(ALL_LIBS) $(GSL_LIBS)
 @Hsource@BGZIP = $(HTSDIR)/bgzip
 @Hsource@TABIX = $(HTSDIR)/tabix
 HTSLIB_CPPFLAGS = @HTSLIB_CPPFLAGS@
 @Hinstall@HTSLIB_LDFLAGS = @HTSLIB_LDFLAGS@
 @Hinstall@HTSLIB_LIB = -lhts
-@Hinstall@W32_PLUGIN_LIBS = libbcftools.a $(HTSLIB_LDFLAGS) $(HTSLIB_LIB) $(ALL_LIBS)
+@Hinstall@W32_PLUGIN_LIBS = libbcftools.a $(HTSLIB_LDFLAGS) $(HTSLIB_LIB) $(ALL_LIBS) $(GSL_LIBS)