[PATCH-for-10.2 1/3] qga/commands: Include proper Solaris header for getloadavg()

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Solaris declares getloadavg() in <sys/loadavg.h>:

    getloadavg(3C)       Standard C Library Functions       getloadavg(3C)

    NAME
           getloadavg - get system load averages

    SYNOPSIS
           #include <sys/loadavg.h>

           int getloadavg(double loadavg[], int nelem);

    [...]

    Oracle Solaris 11.4           23 Jul 2020               getloadavg(3C)

Include it in order to avoid:

  ../qga/commands-posix.c: In function 'qmp_guest_get_load':
  ../qga/commands-posix.c:1408:9: error: implicit declaration of function 'getloadavg' [-Wimplicit-function-declaration]
   1408 |     if (getloadavg(loadavg, G_N_ELEMENTS(loadavg)) < 0) {
      |         ^~~~~~~~~~
  ../qga/commands-posix.c:1408:9: warning: nested extern declaration of 'getloadavg' [-Wnested-externs]

../configure relevant output:

  C compiler for the host machine: gcc (gcc 14.2.0 "gcc (GCC) 14.2.0")
  C linker for the host machine: gcc ld.solaris 5.11-1.3315

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 qga/commands-posix.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index c7059857e44..66f3e6f6733 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -43,6 +43,9 @@
 #include <net/ethernet.h>
 #endif
 #ifdef CONFIG_SOLARIS
+#ifdef CONFIG_GETLOADAVG
+#include <sys/loadavg.h>
+#endif
 #include <sys/sockio.h>
 #endif
 #endif
-- 
2.51.0