FindOpenSSL: Support version 1.1.1 under QNX 7.0

QNX 7.0 allows parallel installation of OpenSSL 1.0.2 and OpenSSL 1.1.1. The
1.1.1 version has "1_1" appended to the include dir and library names.

Modules/FindOpenSSL.cmake

@@ -148,6 +148,19 @@ if(OPENSSL_USE_STATIC_LIBS)
   endif()
 endif()
 
+if(CMAKE_SYSTEM_NAME STREQUAL "QNX" AND
+  CMAKE_SYSTEM_VERSION VERSION_GREATER_EQUAL "7.0" AND CMAKE_SYSTEM_VERSION VERSION_LESS "7.1" AND
+  OpenSSL_FIND_VERSION VERSION_GREATER_EQUAL "1.1" AND OpenSSL_FIND_VERSION VERSION_LESS "1.2")
+  # QNX 7.0.x provides openssl 1.0.2 and 1.1.1 in parallel:
+  # * openssl 1.0.2: libcrypto.so.2 and libssl.so.2, headers under usr/include/openssl
+  # * openssl 1.1.1: libcrypto1_1.so.2.1 and libssl1_1.so.2.1, header under usr/include/openssl1_1
+  # See http://www.qnx.com/developers/articles/rel_6726_0.html
+  set(_OPENSSL_FIND_PATH_SUFFIX "openssl1_1")
+  set(_OPENSSL_NAME_POSTFIX "1_1")
+else()
+  set(_OPENSSL_FIND_PATH_SUFFIX "include")
+endif()
+
 if (WIN32)
   # http://www.slproweb.com/products/Win32OpenSSL.html
   set(_OPENSSL_ROOT_HINTS
@@ -200,7 +213,7 @@ find_path(OPENSSL_INCLUDE_DIR
     ${_OPENSSL_INCLUDEDIR}
     ${_OPENSSL_INCLUDE_DIRS}
   PATH_SUFFIXES
-    include
+    ${_OPENSSL_FIND_PATH_SUFFIX}
 )
 
 if(WIN32 AND NOT CYGWIN)
@@ -430,7 +443,7 @@ else()
 
   find_library(OPENSSL_SSL_LIBRARY
     NAMES
-      ssl
+      ssl${_OPENSSL_NAME_POSTFIX}
       ssleay32
       ssleay32MD
     NAMES_PER_DIR
@@ -444,7 +457,7 @@ else()
 
   find_library(OPENSSL_CRYPTO_LIBRARY
     NAMES
-      crypto
+      crypto${_OPENSSL_NAME_POSTFIX}
     NAMES_PER_DIR
     ${_OPENSSL_ROOT_HINTS_AND_PATHS}
     HINTS
@@ -681,3 +694,6 @@ endif()
 if(OPENSSL_USE_STATIC_LIBS)
   set(CMAKE_FIND_LIBRARY_SUFFIXES ${_openssl_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES})
 endif()
+
+unset(_OPENSSL_FIND_PATH_SUFFIX)
+unset(_OPENSSL_NAME_POSTFIX)