json-c: Update version from 0.12.1 to 0.15

nvme-cli needs `json_util_get_last_err()` not in 0.12.1:

    /usr/lib/gcc/x86_64-pc-linux-gnu/7.5.0/../../../../x86_64-pc-linux-gnu/bin/ld: ../src//libnvme.a(json.ol): in function `json_read_config':
    /home/pmenzel/src/nvme-cli/libnvme/src/nvme/json.c:154: undefined reference to `json_util_get_last_err'
    /usr/lib/gcc/x86_64-pc-linux-gnu/7.5.0/../../../../x86_64-pc-linux-gnu/bin/ld: ../src//libnvme.a(json.ol): in function `json_update_config':
    /home/pmenzel/src/nvme-cli/libnvme/src/nvme/json.c:271: undefined reference to `json_util_get_last_err'

So update to the current release 0.15 from July 2020.

Remove obsolete Makefile patching.

json-c.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION json-c-0.12.1-0
+# BEE_VERSION json-c-0.15-0
 
 ## this file was created by bee init and should be executed to build a
 ## bee-package. (Additional hints are located at the end of this file.)
@@ -49,10 +49,9 @@ SRCURL[0]="https://s3.amazonaws.com/json-c_releases/releases/json-c-${PKGVERSION
 #    bee_extract "${@}"
 #}
 
-mee_patch() {
-    bee_patch "${@}"
-    sed -i s/-Werror// Makefile.in
-}
+#mee_patch() {
+#    bee_patch "${@}"
+#}
 
 mee_configure() {
     bee_configure --disable-static