Provisioning: Fix cleanup when building GCC from sources

We need sudo rights to delete the temporary folder
where sources for GCC are extracted.

Change-Id: Ic0642e44eabfc3449f7ce5903a63bd38924f7dca
Reviewed-by: Heikki Halmet <heikki.halmet@qt.io>

coin/provisioning/common/linux/gcc.sh

@@ -83,7 +83,7 @@ function InstallGCC() {
         sudo make install
 
         rm -rf "$targetFile"
-        rm -rf "$tmpFolder/gcc-$version"
+        sudo rm -rf "$tmpFolder/gcc-$version"
     fi
 
     # openSUSE has update-alternatives under /usr/sbin and it has grouped the commands by means of master and slave links