oniguruma: fix CVE-2019-13224 & CVE-2019-13225

The patches were taken from upstream commits.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

libs/oniguruma/Makefile

@@ -6,13 +6,13 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=oniguruma
 PKG_VERSION:=6.9.2
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=onig-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://codeload.github.com/kkos/oniguruma/tar.gz/v$(PKG_VERSION)?
 PKG_HASH:=3b568a9050839e7828b2f2d5bc9cd3650979b6b54a080f54c515320dddda06b0
 
-PKG_MAINTAINER:=Eneas U de Queiroz <cote2004-github@yahoo.com.br>
+PKG_MAINTAINER:=Eneas U de Queiroz <cotequeiroz@gmail.com>
 PKG_LICENSE:=BSD-2-Clause
 PKG_LICENSE_FILES:=COPYING
 PKG_CPE_ID:=cpe:/a:oniguruma_project:oniguruma
@@ -27,7 +27,6 @@ define Package/oniguruma
     CATEGORY:=Libraries
     TITLE:=Regular expression library for different character encodings
     URL:=https://github.com/kkos/oniguruma
-    DEPENDS:=
     ABI_VERSION:=5
 endef