Move the check for curl, python, and libcjson into configure.ac

Instead of hardcoding the include paths and library paths in the
Makefile, add dynamic checks for curl, python, and libcjson into
configure.ac.

Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>

Author: saiarcot895

CLI/klish/Makefile

@@ -19,7 +19,7 @@ all : $(SRC_REPLACEMENTS)
 	tar xzvf klish-$(KLISH_VERSION).tgz -C $(SONIC_CLI_ROOT)
 	cd ${KLISH_SRC} && QUILT_PATCHES=${CURDIR}/patches quilt push -a
 
-	cd ${KLISH_SRC} && sh autogen.sh && ./configure --with-libxml2=/usr $(CROSS_CONFIGURE_OPTS) --enable-debug=no LIBS='-l:libcurl-gnutls.so.4 -L$(LIB_PATH) -lpython3.7m -Wl,-rpath=$(LIB_PATH) -lcjson' CFLAGS='${CFLAGS} -g -I/usr/include/python3.7m' CPPFLAGS='${CPPFLAGS} -I/usr/include/cjson' && make
+	cd ${KLISH_SRC} && sh autogen.sh && ./configure --with-libxml2=/usr $(CROSS_CONFIGURE_OPTS) --enable-debug=no && make
 
 	mkdir -p $(SONIC_CLI_ROOT)/target/.libs
 	cp $(CURDIR)/clish_start $(SONIC_CLI_ROOT)/target/.

CLI/klish/patches/0002-enhance-Klish-parser-with-improved-usability-and-pyt.patch

@@ -1,7 +1,7 @@
-From e629c76e73aa7b89490a8f8b52557fc22ec405d4 Mon Sep 17 00:00:00 2001
+From 0bdd0a1c0631c27cf21a60b2e3d6f1d17a950279 Mon Sep 17 00:00:00 2001
 From: Kwan <kwangsuk_kim@dell.com>
 Date: Mon, 4 Jan 2021 15:10:03 -0800
-Subject: [PATCH] enhance Klish parser with improved usability and python3
+Subject: [PATCH 2/2] enhance Klish parser with improved usability and python3
  support (#76)
 MIME-Version: 1.0
 Content-Type: text/plain; charset=UTF-8
@@ -83,7 +83,7 @@ Miscellaneous bug fixes - subcommands or param while pressing tab etc.
  clish/shell/shell_tinyrl.c          | 282 +++++++++++--
  clish/shell/shell_wdog.c            |   2 +
  clish/shell/shell_xml.c             |  42 +-
- configure.ac                        |   2 +
+ configure.ac                        |  26 ++
  lub/argv.h                          |   1 +
  lub/argv/argv.c                     |  21 +
  lub/string.h                        |   2 +
@@ -102,7 +102,7 @@ Miscellaneous bug fixes - subcommands or param while pressing tab etc.
  tinyrl/history/history.c            |  20 +-
  tinyrl/tinyrl.c                     |  74 ++++
  tinyrl/tinyrl.h                     |  12 +
- 48 files changed, 3276 insertions(+), 223 deletions(-)
+ 48 files changed, 3300 insertions(+), 223 deletions(-)
  create mode 100644 clish/param/mgmt_clish_extn_param.c
  create mode 100644 clish/plugin/clish_api.h
  create mode 100644 clish/plugin/mgmt_clish_utils.c
@@ -3951,7 +3951,7 @@ index 8467ec1..6a4b49e 100644
  	return res;
  }
 diff --git a/configure.ac b/configure.ac
-index 9d3e49f..42e46e6 100644
+index 9d3e49f..9666bb7 100644
 --- a/configure.ac
 +++ b/configure.ac
 @@ -25,6 +25,8 @@ AC_PROG_CC
@@ -3963,6 +3963,38 @@ index 9d3e49f..42e46e6 100644
  AC_CONFIG_HEADERS([config.h])
  AM_INIT_AUTOMAKE(subdir-objects)
  AM_PROG_CC_C_O
+@@ -107,6 +109,31 @@ if test x$use_lua != xno; then
+     AX_LUA_LIBS()
+ fi
+ 
++################################
++# Get Python headers
++################################
++AM_PATH_PYTHON([3])
++AX_PYTHON_DEVEL([>= '3'])
++
++CPPFLAGS="${CPPFLAGS} ${PYTHON_CPPFLAGS}"
++LDFLAGS="${LDFLAGS} ${PYTHON_LIBS}"
++
++################################
++# Get Curl headers
++################################
++PKG_CHECK_MODULES([CURL], [libcurl])
++
++CPPFLAGS="${CPPFLAGS} ${CURL_CFLAGS}"
++LDFLAGS="${LDFLAGS} ${CURL_LIBS}"
++
++################################
++# Get cjson headers
++################################
++PKG_CHECK_MODULES([CJSON], [libcjson])
++
++CPPFLAGS="${CPPFLAGS} ${CJSON_CFLAGS}"
++LDFLAGS="${LDFLAGS} ${CJSON_LIBS}"
++
+ ################################
+ # Check for the roxml library
+ ################################
 diff --git a/lub/argv.h b/lub/argv.h
 index 7e0c7cc..7da2bc4 100644
 --- a/lub/argv.h