common-glibc: define bash_cv_getcwd_malloc

We do not want bash to use internal code for getcwd() because
it can fail in certain filesystem types.  Trust that the function
in glibc is not "broken".

(From OE-Core rev: 72539c68e4a6ef1497af3f707107c3a69ab37bbd)

Signed-off-by: Joe Slater <jslater@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/site/common-glibc

@@ -18,6 +18,7 @@ ac_cv_func_getaddrinfo=${ac_cv_func_getaddrinfo=yes}
 # bash
 bash_cv_under_sys_siglist=${bash_cv_under_sys_siglist=yes}
 bash_cv_sys_siglist=${bash_cv_sys_siglist=yes}
+bash_cv_getcwd_malloc=${bash_cv_getcwd_malloc=yes}
 
 # clamav
 clamav_av_func_working_snprintf_long=${clamav_av_func_working_snprintf_long=yes}