launchpad: enclose only CFLAGS values in quotes

Build was still failing on a command not found as it tries to execute CFLAGS as a command.

Refs #44894

Change-Id: I67aaff5d11280125bac439f3afefae78c7b55684

tools/build-system/launchpad/sflphone-common-video/debian/rules

@@ -38,7 +38,7 @@ configure-stamp:
 	# Add here commands to configure the package.
 	./autogen.sh
 	./configure --prefix=/usr --enable-video
-	cd libs/pjproject-2.2.1; "CFLAGS=-fPIC -O2 -DNDEBUG" ./configure $(PJ_CONFIG_OPTIONS)
+	cd libs/pjproject-2.2.1; CFLAGS="-fPIC -O2 -DNDEBUG" ./configure $(PJ_CONFIG_OPTIONS)
 	touch configure-stamp
 
 #Architecture

tools/build-system/launchpad/sflphone-common/debian/rules

@@ -38,7 +38,7 @@ configure-stamp:
 	# Add here commands to configure the package.
 	./autogen.sh
 	./configure --prefix=/usr
-	cd libs/pjproject-2.2.1; "CFLAGS=-fPIC -O2 -DNDEBUG" ./configure $(PJ_CONFIG_OPTIONS)
+	cd libs/pjproject-2.2.1; CFLAGS="-fPIC -O2 -DNDEBUG" ./configure $(PJ_CONFIG_OPTIONS)
 	touch configure-stamp
 
 #Architecture