Linux: rev 949 trunk is stable..not sure about others

[xing at litespeedtech.com]

Couldn't test changes since rev 949 and before 956 to isolate problem.
All of the revisions in between compile with error:

vcl_compile.c:677: error: syntax error before "__unused"
vcl_compile.c: In function `HeaderVar':
vcl_compile.c:685: error: `t' undeclared (first use in this function)
vcl_compile.c:685: error: (Each undeclared identifier is reported only once
vcl_compile.c:685: error: for each function it appears in.)
vcl_compile.c:692: error: `vh' undeclared (first use in this function)
vcl_compile.c: At top level:
vcl_compile.c:1889: error: syntax error before "__unused"
vcl_compile.c: In function `VCC_T_render':
vcl_compile.c:1893: error: `args' undeclared (first use in this function)
vcl_compile.c:1894: error: `f' undeclared (first use in this function)
vcl_compile.c: At top level:
vcl_compile.c:1899: error: syntax error before "__unused"
vcl_compile.c: In function `VCC_T_arginfo':
vcl_compile.c:1902: error: `n' undeclared (first use in this function)
vcl_compile.c:1903: error: `argtypes' undeclared (first use in this
function)
make[3]: *** [vcl_compile.lo] Error 1