RedfishPkg/RedfishCrtLib: Add more CRT functions

RedfishPkg/RedfishCrtLib: Add more CRT functions

Add more functions which were missed in the first time commit,
that causes the build error with EDK2 Redfish feature driver.

strerror - We don't support this on edk2 environment.
strpbrk  - Cloned this function from edk2-LibC
File operation functions - Not supported on edk2 environment.

Signed-off-by: Abner Chang <abner.chang@hpe.com>
Cc: Nickle Wang <nickle.wang@hpe.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Nickle Wang <nickle.wang@hpe.com>
Acked-by: Leif Lindholm <leif@nuviainc.com>