Append to LDFLAGS so it can respect the LDFLAGS passed from environment. This helps
with using propert GNU_HASH settings during link on mips/arm

Upstream-Status: Pending
Signed-off-by: Khem Raj <raj.khem@gmail.com>
--- a/src/Makefile
+++ b/src/Makefile
@@ -24,7 +24,7 @@ CFLAGS = -Wall -Wextra -O \
 	 -DCONFIG_SSL_CAPATH='"$(SSLCAPATH)"' \
 	 -DCONFIG_SSL_CAFILE='"$(SSLCAFILE)"' \
 	 $(INCDIRS) $(MYCFLAGS)
-LDFLAGS = $(LIBDIRS) $(MYLDFLAGS)
+LDFLAGS += $(LIBDIRS) $(MYLDFLAGS)
 LIBS = -lm -ldl $(LIBLUA) $(LIBPCRE) $(LIBSSL) $(LIBCRYPTO) $(MYLIBS)
 
 MAN1 = imapfilter.1