gphoto: Fix regex to remove --sysroot from CC in config.h

Ensure that the string --syroot=/a/b/c is deleted but not the closing quote

This fixes
QA Issue: File /usr/bin/gphoto2 in package gphoto2 contains reference to TMPDIR [buildpaths]

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-graphics/gphoto2/gphoto2_2.5.28.bb

@@ -20,5 +20,5 @@ EXTRA_OECONF += "--with-jpeg-prefix=${STAGING_INCDIR} \
 "
 
 do_configure:append() {
-	sed -i -e 's#${RECIPE_SYSROOT}##g' ${B}/config.h
+	sed -i -E 's/--sysroot=[^ "]*([" ])/\1/g' ${B}/config.h
 }