CMake: prevent mismatched package name warnings

Use all caps for the packages.

Closes https://github.com/wxWidgets/wxWidgets/pull/1886

build/cmake/modules/FindXTEST.cmake

@@ -0,0 +1,51 @@
+# - Find XTEST
+# Find the XTEST libraries
+#
+#  This module defines the following variables:
+#     XTEST_FOUND        - true if XTEST_INCLUDE_DIR & XTEST_LIBRARY are found
+#     XTEST_LIBRARIES    - Set when XTEST_LIBRARY is found
+#     XTEST_INCLUDE_DIRS - Set when XTEST_INCLUDE_DIR is found
+#
+#     XTEST_INCLUDE_DIR  - where to find XTest.h, etc.
+#     XTEST_LIBRARY      - the XTEST library
+#
+
+#=============================================================================
+# Copyright 2011 O.S. Systems Software Ltda.
+# Copyright 2011 Otavio Salvador <otavio@ossystems.com.br>
+# Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#=============================================================================
+
+find_path(XTEST_INCLUDE_DIR NAMES X11/extensions/XTest.h
+          PATH_SUFFIXES X11/extensions
+          PATHS /opt/X11/include
+          DOC "The XTest include directory"
+)
+
+find_library(XTEST_LIBRARY NAMES Xtst
+          PATHS /opt/X11/lib
+          DOC "The XTest library"
+)
+
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(XTEST DEFAULT_MSG XTEST_LIBRARY XTEST_INCLUDE_DIR)
+
+if(XTEST_FOUND)
+  set( XTEST_LIBRARIES ${XTEST_LIBRARY} )
+  set( XTEST_INCLUDE_DIRS ${XTEST_INCLUDE_DIR} )
+endif()
+
+mark_as_advanced(XTEST_INCLUDE_DIR XTEST_LIBRARY)
+