[Buildroot] [PATCH v2] sngrep: fix wchar detection.

[Adam Duskett <aduskett@gmail.com>]

Ncurses detection is currently broken in buildroot.

This patch does the following:
 - Add SNGREP_CHECK_SCRIPT to configure.ac which checks for a
   libname, a function in that library, sets a define if found, and
   if not found, moves on to the next part. This is taken from the
   htop configure.ac.

 - Adds SNGREP_CHECK_LIB to configure.ac which checks for a
   library, a function within that library, sets a define if that function
   is found, and if not found, moves on to the next part.
   This is taken from the htop configure.ac

 - Modifies scrollbar.h and ui_panel.h to include <wctypes.h> instead of
   <ncursesw/ncurses.h> if unicode is supported.

Signed-off-by: Adam Duskett <aduskett@codeblue.com>
---
Changes v1 -> v2:
  - Added # Locally computed header to sngrep.hash

  - The original patch was committed upstream. Moved patch to a url
    and added a sha256 sum for the patch.
    
 package/sngrep/sngrep.hash | 2 ++
 package/sngrep/sngrep.mk   | 9 ++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/package/sngrep/sngrep.hash b/package/sngrep/sngrep.hash
index bc28545..5966d63 100644
--- a/package/sngrep/sngrep.hash
+++ b/package/sngrep/sngrep.hash
@@ -1 +1,3 @@
+# Locally computed
 sha256 7385ac202de6d6a1feffb2fd514600563133d9dfa7fb47be052de839abcc1d52 sngrep-v1.4.3.tar.gz
+sha256 a3376abe20cca95a13ee88188ba5ba50425c93afc927cca018c50b0309ad21f9  4740f3341a99eaec105dee202a6fa7828212cdf1.patch
diff --git a/package/sngrep/sngrep.mk b/package/sngrep/sngrep.mk
index 560872f..9dda158 100644
--- a/package/sngrep/sngrep.mk
+++ b/package/sngrep/sngrep.mk
@@ -14,8 +14,15 @@ SNGREP_DEPENDENCIES = libpcap ncurses host-pkgconf
 SNGREP_CONF_ENV += \
 	$(if $(BR2_STATIC_LIBS),LIBS="`$(STAGING_DIR)/usr/bin/pcap-config --static --libs`")
 
-# our ncurses wchar support is not properly detected
+# This patch fixes ncurses wchar detection
+SNGREP_PATCH = \
+	https://github.com/irontec/sngrep/pull/191/commits/4740f3341a99eaec105dee202a6fa7828212cdf1.patch
+
+ifeq ($(BR2_PACKAGE_NCURSES_WCHAR),y)
+SNGREP_CONF_OPTS += --enable-unicode
+else
 SNGREP_CONF_OPTS += --disable-unicode
+endif
 
 # openssl and gnutls can't be enabled at the same time.
 ifeq ($(BR2_PACKAGE_OPENSSL),y)
-- 
2.9.4