use pkg_check_modules() quiet in other modules

Those modules will already print what they found or not using FPHSA, no need
to do this twice.

Modules/FindGnuTLS.cmake

@@ -35,8 +35,8 @@ IF (NOT WIN32)
    # try using pkg-config to get the directories and then use these values
    # in the FIND_PATH() and FIND_LIBRARY() calls
    # also fills in GNUTLS_DEFINITIONS, although that isn't normally useful
-   FIND_PACKAGE(PkgConfig)
-   PKG_CHECK_MODULES(PC_GNUTLS gnutls)
+   FIND_PACKAGE(PkgConfig QUIET)
+   PKG_CHECK_MODULES(PC_GNUTLS QUIET gnutls)
    SET(GNUTLS_DEFINITIONS ${PC_GNUTLS_CFLAGS_OTHER})
 ENDIF (NOT WIN32)
 

Modules/FindLibXml2.cmake

@@ -23,8 +23,8 @@
 
 # use pkg-config to get the directories and then use these values
 # in the FIND_PATH() and FIND_LIBRARY() calls
-FIND_PACKAGE(PkgConfig)
-PKG_CHECK_MODULES(PC_LIBXML libxml-2.0 QUIET)
+FIND_PACKAGE(PkgConfig QUIET)
+PKG_CHECK_MODULES(PC_LIBXML QUIET libxml-2.0)
 SET(LIBXML2_DEFINITIONS ${PC_LIBXML_CFLAGS_OTHER})
 
 FIND_PATH(LIBXML2_INCLUDE_DIR NAMES libxml/xpath.h

Modules/FindLibXslt.cmake

@@ -25,7 +25,7 @@
 
 # use pkg-config to get the directories and then use these values
 # in the FIND_PATH() and FIND_LIBRARY() calls
-FIND_PACKAGE(PkgConfig)
+FIND_PACKAGE(PkgConfig QUIET)
 PKG_CHECK_MODULES(PC_LIBXSLT QUIET libxslt)
 SET(LIBXSLT_DEFINITIONS ${PC_LIBXSLT_CFLAGS_OTHER})
 

Modules/FindOpenSSL.cmake

@@ -25,10 +25,8 @@
 #  License text for the above reference.)
 
 if (UNIX)
-  find_package(PkgConfig)
-  if (PKG_CONFIG_FOUND)
-    pkg_check_modules(_OPENSSL openssl)
-  endif (PKG_CONFIG_FOUND)
+  find_package(PkgConfig QUIET)
+  pkg_check_modules(_OPENSSL QUIET openssl)
 endif (UNIX)
 
 # http://www.slproweb.com/products/Win32OpenSSL.html