scripted-diff: Rename PACKAGE_* variables to CLIENT_*

This change ensures consistent use of the `CLIENT_` namespace everywhere
in the repository.

-BEGIN VERIFY SCRIPT-

ren() { sed -i "s/\<$1\>/$2/g" $( git grep -l "$1" ./cmake ./src :\(exclude\)./src/secp256k1 ./test ) ; }

ren PACKAGE_NAME      CLIENT_NAME
ren PACKAGE_VERSION   CLIENT_VERSION_STRING
ren PACKAGE_URL       CLIENT_URL
ren PACKAGE_BUGREPORT CLIENT_BUGREPORT

-END VERIFY SCRIPT-

cmake/bitcoin-build-config.h.in

@@ -124,16 +124,16 @@
 #cmakedefine HAVE_VM_VM_PARAM_H 1
 
 /* Define to the address where bug reports for this package should be sent. */
-#define PACKAGE_BUGREPORT "@CLIENT_BUGREPORT@"
+#define CLIENT_BUGREPORT "@CLIENT_BUGREPORT@"
 
 /* Define to the full name of this package. */
-#define PACKAGE_NAME "@CLIENT_NAME@"
+#define CLIENT_NAME "@CLIENT_NAME@"
 
 /* Define to the home page for this package. */
-#define PACKAGE_URL "@PROJECT_HOMEPAGE_URL@"
+#define CLIENT_URL "@PROJECT_HOMEPAGE_URL@"
 
 /* Define to the version of this package. */
-#define PACKAGE_VERSION "@CLIENT_VERSION_STRING@"
+#define CLIENT_VERSION_STRING "@CLIENT_VERSION_STRING@"
 
 /* Define to 1 if strerror_r returns char *. */
 #cmakedefine STRERROR_R_CHAR_P 1