Remove useless include file filters

The commit "Cleanup regular expressions" removed real include filter
expressions and replaced them with lines like

  INCLUDE_REGULAR_EXPRESSION("^.*$")

that do no filtering.  We simplify the change by removing the lines
altogether.

CMakeLists.txt

@@ -346,7 +346,6 @@ SET(EXECUTABLE_OUTPUT_PATH ${CMake_BINARY_DIR}/bin CACHE INTERNAL
   "Where to put the executables for CMake")
 SET(LIBRARY_OUTPUT_PATH "" CACHE INTERNAL 
   "Where to put the libraries for CMake")
-INCLUDE_REGULAR_EXPRESSION("^.*$")
 
 # The CMake executables usually do not need any rpath to run in the build or
 # install tree.

Utilities/cmcurl/CMakeLists.txt

@@ -4,8 +4,6 @@ IF(COMMAND CMAKE_POLICY)
 ENDIF(COMMAND CMAKE_POLICY)
 PROJECT(LIBCURL C)
 
-INCLUDE_REGULAR_EXPRESSION("^.*$")
-
 # Setup package meta-data
 SET(PACKAGE "curl")
 SET(VERSION "7.16.1")

Utilities/cmexpat/CMakeLists.txt

@@ -1,5 +1,4 @@
 PROJECT(CMEXPAT)
-INCLUDE_REGULAR_EXPRESSION("^.*$")
 
 SET(expat_SRCS
   xmlparse.c

Utilities/cmzlib/CMakeLists.txt

@@ -6,9 +6,6 @@ INCLUDE_DIRECTORIES(
   "${CMZLIB_BINARY_DIR}/.."
   )
 
-# Match all headers for dependencies but complain about none.
-INCLUDE_REGULAR_EXPRESSION("^.*$")
-
 # source files for zlib
 SET(ZLIB_SRCS
   adler32.c  compress.c  crc32.c  deflate.c  gzio.c   inffast.c