This is a forward port of erlang-20.3.2-dont-ignore-LDFLAGS.patch
Anthony G. Basile <blueness@gentoo.org>

diff -Naur otp-OTP-22.0.orig/lib/megaco/src/flex/Makefile.in otp-OTP-22.0/lib/megaco/src/flex/Makefile.in
--- otp-OTP-22.0.orig/lib/megaco/src/flex/Makefile.in	2019-05-10 12:42:49.000000000 +0000
+++ otp-OTP-22.0/lib/megaco/src/flex/Makefile.in	2019-06-04 15:53:37.899372564 +0000
@@ -47,7 +47,7 @@
 CC      = @DED_CC@
 CFLAGS_MT = $(CFLAGS) @DED_THR_DEFS@
 LD      = @DED_LD@
-LDFLAGS = @DED_LDFLAGS@
+LDFLAGS += @DED_LDFLAGS@
 LEX     = @LEX@
 LEXLIB  = @LEXLIB@
 PERL    = @PERL@
diff -Naur otp-OTP-22.0.orig/lib/odbc/c_src/Makefile.in otp-OTP-22.0/lib/odbc/c_src/Makefile.in
--- otp-OTP-22.0.orig/lib/odbc/c_src/Makefile.in	2019-05-10 12:42:49.000000000 +0000
+++ otp-OTP-22.0/lib/odbc/c_src/Makefile.in	2019-06-04 15:53:37.900372572 +0000
@@ -82,7 +82,7 @@
 CFLAGS = $(TYPEFLAGS) @CFLAGS@ @THR_DEFS@ @DEFS@
 EI_LDFLAGS = -L$(EI_ROOT)/obj$(TYPEMARKER)/$(TARGET)
 LD = @LD@
-LDFLAGS =  $(ODBC_LIB) $(EI_LDFLAGS)
+LDFLAGS += $(ODBC_LIB) $(EI_LDFLAGS)
 LIBS = @LIBS@ @THR_LIBS@ $(EI_LIB)
 INCLUDES = -I. $(ODBC_INCLUDE) $(EI_INCLUDE)
 TARGET_FLAGS =  @TARGET_FLAGS@