compile errors with older versions of GCC

[aturner]

> gcc -DHAVE_CONFIG_H -I. -I../../src    -I.. -I../..
> -D_U_="__attribute__((unused))"  -Wall -O3 -std=gnu99
> -I/usr/local/include -MT cache.o -MD -MP -MF .deps/cache.Tpo -c -o cache.o
> cache.c
> cache.c:326:1: directives may not be used inside a macro argument
> cache.c:320:55: unterminated argument list invoking macro "dbgx"
> cache.c: In function `add_cache':
> cache.c:329: `dbgx' undeclared (first use in this function)
> cache.c:329: (Each undeclared identifier is reported only once
> cache.c:329: for each function it appears in.)
> cache.c:329: parse error before string constant
> make[4]: *** [cache.o] Error 1

Linux version 2.4.20-6 (gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5))

[aturner]

(In [1906]) fix compile issue w/ older gcc refs #201