[wishstudio]

Depending on autoconf and system compiler version, AC_PROG_CC sometimes inserts compiler flags into the CC variable, making CC not a single word. For example, on autoconf 2.73 and clang 21.18 I got CC="clang -std=gnu23". This peculiar semantic breaks the CC string injection resulting in compilation error:

In file included from <built-in>:409:
<command line>:60:12: warning: missing terminating '"' character [-Winvalid-pp-token]
   60 | #define CC "clang
      |            ^
config.c:126:26: error: expected ';' after return statement
  126 |         return "Compiled with: " LG_COMP "\n"
      |                                 ^
      |                                 ;
1 warning and 1 error generated.

This PR changes the CC passing to only pass the first word of the CC string, fixing this issue.

[linas]

Thanks!