Remove a misspelled (and redundant) build option from the README.

Remove the option from the debian build also, since the
'deprecation_warnings' option is already false by default.

Author: mtwebster

README

@@ -21,7 +21,7 @@ Installation
     meson debian/build \
         --prefix=/usr/local \
         --buildtype=debug \
-        -D deprecated_warnings=false
+        -D deprecation_warnings=false
 
 2) Compile and install (sudo is needed for install)
 

debian/rules

@@ -10,8 +10,7 @@ export DPKG_GENSYMBOLS_CHECK_LEVEL = 2
 override_dh_auto_configure:
 	dh_auto_configure -- \
 		--buildtype=debug \
-		-Dpnp_ids=/usr/share/hwdata/pnp.ids \
-		-Ddeprecation_warnings=false
+		-Dpnp_ids=/usr/share/hwdata/pnp.ids
 
 override_dh_strip:
 	dh_strip -Xdesktop -Xcinnamon --dbg-package=libcvc-dbg