Use separately built libgc-static to make sure we actually statically link bdwgc

Author: jechter

external/bdwgc

@@ -18,8 +18,7 @@ libgc_libs=$(monodir)/libgc/libmonogc.la
 libgc_static_libs=$(monodir)/libgc/libmonogc-static.la
 endif
 
-libbdwgc_libs=$(monodir)/external/bdwgc/libgc.la
-libbdwgc_static_libs=$(monodir)/external/bdwgc/libgc.la
+libbdwgc_libs=$(monodir)/external/bdwgc/libgc-static.la
 
 boehm_libs=	\
 	$(monodir)/mono/metadata/libmonoruntime.la	\
@@ -49,7 +48,7 @@ bdwgc_static_libs=	\
 	$(monodir)/mono/metadata/libmonoruntimebdwgc-static.la	\
 	$(monodir)/mono/utils/libmonoutils.la \
 	$(GLIB_LIBS) $(LIBICONV) \
-	$(libbdwgc_static_libs)
+	$(libbdwgc_libs)
 
 sgen_static_libs = \
 	$(monodir)/mono/metadata/libmonoruntimesgen-static.la	\