modem/libsmdpkt_wrapper: disable Werror

Fixes the build with GCC-9.

modem/libsmdpkt_wrapper/APKBUILD

@@ -1,6 +1,6 @@
 pkgname=libsmdpkt_wrapper
 pkgver=0.1
-pkgrel=0
+pkgrel=1
 pkgdesc="wrapper to get ofonod and qmicli working on smdpkt devices (MSM kernel's SMD)"
 url="https://github.com/scintill/libsmdpkt_wrapper"
 arch="all"
@@ -12,6 +12,11 @@ source="$pkgname-$_tag.tar.gz::https://github.com/scintill/libsmdpkt_wrapper/arc
 builddir="$srcdir""/libsmdpkt_wrapper-${pkgver}"
 options="!check"
 
+prepare() {
+	default_prepare
+	sed s/-Werror/-W/g -i Makefile
+}
+
 build() {
 	cd "$builddir"
 	make