lshwc: Fix compile error for gcc <8.1

With gcc < 8.1 the following compile error occurs:

lshwc.c:52:37: error: initializer element is not constant
 static unsigned int read_interval = ioctlsleep, cfvn, csvn, authorization;
                                     ^~~~~~~~~~

Even though this gcc bug was fixed in gcc 8.1+, change the constant
definition to a #define to make the tool compile with older compilers as
well.

Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69960
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66618
Signed-off-by: Jan Höppner <[email protected]>

cpumf/lshwc.c

@@ -46,9 +46,9 @@
 #define CPUS_POSSIBLE	"/sys/devices/system/cpu/possible"
 #define CPUS_KERNELMAX	"/sys/devices/system/cpu/kernel_max"
 #define MAXCTRS		512
+#define IOCTLSLEEP	60U
 
-static const unsigned int ioctlsleep = 60;
-static unsigned int read_interval = ioctlsleep, cfvn, csvn, authorization;
+static unsigned int read_interval = IOCTLSLEEP, cfvn, csvn, authorization;
 static unsigned long loop_count = 1;
 static unsigned char *ioctlbuffer;
 static bool allcpu;