msmtp: Do not overwrite LDFLAGS

Fixes DT_RUNPATH (see #3490).

packages/msmtp/build.sh

@@ -2,13 +2,13 @@ TERMUX_PKG_HOMEPAGE=https://marlam.de/msmtp/
 TERMUX_PKG_DESCRIPTION="Lightweight SMTP client"
 TERMUX_PKG_LICENSE="GPL-3.0"
 TERMUX_PKG_VERSION=1.8.3
-TERMUX_PKG_REVISION=1
+TERMUX_PKG_REVISION=2
 TERMUX_PKG_SHA256=3cb2eefd33d048f0f82de100ef39a494e44fd1485e376ead31f733d2f36b92b4
 TERMUX_PKG_SRCURL=https://marlam.de/msmtp/releases/msmtp-$TERMUX_PKG_VERSION.tar.xz
 TERMUX_PKG_DEPENDS="openssl, libidn2"
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--with-tls=openssl"
 
 termux_step_pre_configure() {
-	LDFLAGS=" -llog"
+	LDFLAGS+=" -llog"
 	autoreconf -if
 }