postgis vulnerabilities (OSS-Fuzz)

2 vulnerabilities.

• postgis OSS-Fuzz UNKNOWN READ in double_from_wkb_state OSV-2020-718 Fix available No scoreJuly 1, 2020
• postgis OSS-Fuzz Heap-buffer-overflow in byte_from_wkb_state OSV-2020-540 Fix available No scoreJuly 1, 2020