Fix two instances of possible infinite loops in the linker (#1292)

src/link/script.y

@@ -281,6 +281,7 @@ try_again: // Can't use a `do {} while(0)` loop, otherwise compilers (wrongly) t
 		uint32_t number = c - '0';
 		for (c = context.file.sgetc(); isDecDigit(c); c = context.file.sgetc()) {
 			number = number * 10 + (c - '0');
+			context.file.sbumpc();
 		}
 		return yy::parser::make_number(number);
 	} else if (isIdentChar(c)) { // Note that we match these *after* digit characters!
@@ -319,6 +320,7 @@ try_again: // Can't use a `do {} while(0)` loop, otherwise compilers (wrongly) t
 			if (c == EOF) {
 				break;
 			}
+			context.file.sbumpc();
 		}
 		goto try_again;
 	}