libqmi: remove unknown configure option

The configure option --enable-more-warnings is not recognized by
configure.

Buildlog:
configure: WARNING: unrecognized options: --disable-nls, --enable-more-warnings

Therefore this configure option is removed with this commit.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>
(cherry picked from commit a42f526b0c)

libs/libqmi/Makefile

@@ -66,7 +66,6 @@ CONFIGURE_ARGS += \
 	--disable-gtk-doc-pdf \
 	--disable-silent-rules \
 	--enable-firmware-update \
-	--enable-more-warnings=yes \
 	--without-udev \
 	--without-udev-base-dir