Remove unused patch

radc_divbyzero.patch

@@ -1,26 +0,0 @@
---- a/internal/dcraw_common.cpp~	2017-03-04 12:35:59.000000000 -0600
-+++ b/internal/dcraw_common.cpp	2017-09-06 10:47:04.613293577 -0500
-@@ -2716,6 +2716,10 @@
-     checkCancel();
- #endif
-     FORC3 mul[c] = getbits(6);
-+#ifdef LIBRAW_LIBRARY_BUILD
-+    if(!mul[0] || !mul[1] || !mul[2])
-+      throw LIBRAW_EXCEPTION_IO_CORRUPT;
-+#endif
-     FORC3 {
-       val = ((0x1000000/last[c] + 0x7ff) >> 12) * mul[c];
-       s = val > 65564 ? 10:12;
---- a/dcraw/dcraw.c~	2017-09-06 10:48:15.000000000 -0500
-+++ b/dcraw/dcraw.c	2017-09-06 10:49:23.103787467 -0500
-@@ -2228,6 +2228,10 @@
-     ((short *)buf)[i] = 2048;
-   for (row=0; row < height; row+=4) {
-     FORC3 mul[c] = getbits(6);
-+#ifdef LIBRAW_LIBRARY_BUILD
-+    if(!mul[0] || !mul[1] || !mul[2])
-+      throw LIBRAW_EXCEPTION_IO_CORRUPT;
-+#endif
-     FORC3 {
-       val = ((0x1000000/last[c] + 0x7ff) >> 12) * mul[c];
-       s = val > 65564 ? 10:12;