slang: 2.2.4 -> 2.3.0

slang: 2.2.4 -> 2.3.0

* Removed:
  change-char-type-to-signed-char-in-macros.patch
  sprintf-bug-concerning-8-bit-characters.patch
  They are already in the source.

* Updated:
  fix-check-pcre.patch
  fix-check-pcre.patch
  slang-fix-the-iconv-existence-checking.patch

* Use SECURITY_NO_PIE_CFLAGS for SECURITY_CFLAGS, it can't be built with
  "-pie -fpie":
  tmp/sysroots/qemux86-64/usr/lib64/../lib64/Scrt1.o: In function `_start':
  /usr/src/debug/glibc/2.24-r0/git/csu/../sysdeps/x86_64/start.S:104: undefined reference to `main'
  /tmp/ccMFTA8A.o: In function `smg_char_at':
  /usr/src/debug/slang/2.3.0-r0/slang-2.3.0/modules/slsmg-module.c:134: undefined reference to `SLsmg_char_at'
  /tmp/ccMFTA8A.o: In function `smg_resume_smg':

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>