Compile errors on RHEL5, gcc 4.1.2

[rainer]

Reported by Thomas:

1) Several statements of 'error: label at end of compound statement'.

2) Recursive mutexes undefined:

x_sh_files.c: In function mutex_zdirs_init:
x_sh_files.c:289: warning: implicit declaration of function pthread_mutexattr_settype
x_sh_files.c:289: error: PTHREAD_MUTEX_RECURSIVE undeclared (first use in this function)
x_sh_files.c:289: error: (Each undeclared identifier is reported only once
x_sh_files.c:289: error: for each function it appears in.)

[rainer]

Believed to be fixed by changeset [377].