ModemManager: fix gcc6 build

Disable -Werror for gcc6 warning -Wmisleading-indentation

srcpkgs/ModemManager/template

@@ -1,8 +1,7 @@
 # Template file for 'ModemManager'
 pkgname=ModemManager
 version=1.4.14
-revision=2
-build_options="gir"
+revision=3
 build_style=gnu-configure
 configure_args="--disable-static --sbindir=/usr/bin
  --with-udev-base-dir=/usr/lib/udev --with-polkit=permissive
@@ -19,10 +18,16 @@ license="GPL-2"
 distfiles="$FREEDESKTOP_SITE/$pkgname/$pkgname-$version.tar.xz"
 checksum=abe6cdd515a774bcba3afdcdb1e504569801e79282ccdf26099f33cbb8731ba2
 
+build_options="gir"
 if [ -z "$CROSS_BUILD" ]; then
 	build_options_default="gir"
 fi
 
+pre_configure() {
+	# Disable -Werror for gcc6 -Wmisleading-indentation
+	sed -i configure -e"s; -Werror;;g"
+}
+
 ModemManager-devel_package() {
 	depends="libmm-glib>=${version}_${revision}"
 	short_desc+=" - development files"