build: bump bitcoin_config.h packages to v0.18

Follow-up to 48ed65b.

build_msvc/bitcoin_config.h

@@ -346,7 +346,7 @@
 #define PACKAGE_NAME "Bitcoin Core"
 
 /* Define to the full name and version of this package. */
-#define PACKAGE_STRING "Bitcoin Core 0.17.99"
+#define PACKAGE_STRING "Bitcoin Core 0.18.99"
 
 /* Define to the one symbol short name of this package. */
 #define PACKAGE_TARNAME "bitcoin"
@@ -355,7 +355,7 @@
 #define PACKAGE_URL "https://bitcoincore.org/"
 
 /* Define to the version of this package. */
-#define PACKAGE_VERSION "0.17.99"
+#define PACKAGE_VERSION "0.18.99"
 
 /* Define to necessary symbol if this constant uses a non-standard name on
    your system. */