fix compiler errors with gcc 7
fix compiler errors with gcc 7

 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:41:16: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |      const char const *name;
 |                 ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:72:19: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |  static const char const *__empty_list = "''";
 |                    ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:91:18: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |  static const int const WRP_MAP_SIZE             = 4; // mandatory msg_type,source,dest,payload
 |                   ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c: In function '__wrp_keep_alive_to_string':
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:558:16: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |      const char const *keep_alive_fmt =
 |                 ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c: In function '__wrp_auth_struct_to_string':
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:591:16: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |      const char const *auth_fmt = "wrp_auth_msg {\n"
 |                 ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c: In function '__wrp_req_struct_to_string':
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:624:16: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |      const char const *req_fmt = "wrp_req_msg {\n"
 |                 ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c: In function '__wrp_event_struct_to_string':
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:688:16: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |      const char const *event_fmt = "wrp_event_msg {\n"
 |                 ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:41:16: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |      const char const *name;
 |                 ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:72:19: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |  static const char const *__empty_list = "''";
 |                    ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:91:18: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |  static const int const WRP_MAP_SIZE             = 4; // mandatory msg_type,source,dest,payload
 |                   ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c: In function '__wrp_keep_alive_to_string':
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:558:16: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |      const char const *keep_alive_fmt =
 |                 ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c: In function '__wrp_auth_struct_to_string':
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:591:16: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |      const char const *auth_fmt = "wrp_auth_msg {\n"
 |                 ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c: In function '__wrp_req_struct_to_string':
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:624:16: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |      const char const *req_fmt = "wrp_req_msg {\n"
 |                 ^~~~~
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c: In function '__wrp_event_struct_to_string':
 | /.../build-qemux86broadband/tmp/work/i586-rdk-linux/wrp-c/git+AUTOINC+885539a4d9-r0/git/src/wrp-c.c:688:16: error: duplicate 'const' declaration specifier [-Werror=duplicate-decl-specifier]
 |      const char const *event_fmt = "wrp_event_msg {\n"
 |                 ^~~~~
 | cc1: all warnings being treated as errors
 | make[2]: *** [src/CMakeFiles/wrp-c.dir/wrp-c.c.o] Error 1

Signed-off-by: Andre McCurdy <8f09cea6116be1c651ee99f9f5914cb35309ce01@gmail.com>

gbuddappagari/wrp-c,shilpa24balaji/wrp-c