Add mising cmake files in dist

Makefile.am

@@ -982,8 +982,10 @@ EXTRA_DIST = $(@DIST_LANG@_EXTRA_DIST)   \
   cmake/libprotoc.cmake                  \
   cmake/protobuf-config-version.cmake.in \
   cmake/protobuf-config.cmake.in         \
+  cmake/protobuf-lite.pc.cmake           \
   cmake/protobuf-module.cmake.in         \
   cmake/protobuf-options.cmake           \
+  cmake/protobuf.pc.cmake                \
   cmake/protoc.cmake                     \
   cmake/tests.cmake                      \
   editors/README.txt                     \

tests.sh

@@ -63,7 +63,6 @@ build_cpp_distcheck() {
   # List all files that should be included in the distribution package.
   git ls-files | grep "^\(java\|python\|objectivec\|csharp\|js\|ruby\|php\|cmake\|examples\|src/google/protobuf/.*\.proto\)" |\
     grep -v ".gitignore" | grep -v "java/compatibility_tests" |\
-    grep -v "cmake/protobuf.*\.pc\.cmake" |\
     grep -v "python/compatibility_tests" | grep -v "csharp/compatibility_tests" > dist.lst
   # Unzip the dist tar file.
   DIST=`ls *.tar.gz`