Restore exiv2.pc in the mix (#497)

cmake/exiv2.pc.cmake

@@ -0,0 +1,11 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+libdir=@CMAKE_INSTALL_FULL_LIBDIR@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+
+Name: exiv2
+Description: Exif and IPTC metadata library and tools
+Version: @PACKAGE_VERSION@
+URL: @PACKAGE_URL@
+Libs: -L${libdir} -lexiv2 @EXV_LIB_STATIC@
+Cflags: -I${includedir}

src/CMakeLists.txt

@@ -122,8 +122,8 @@ set( LIBEXIV2_PRIVATE_SRC
     helper_functions.cpp
 )
 
-if(MINGW OR MSYS)	
+if(MINGW OR MSYS)
-    set(LIBEXIV2_PRIVATE_SRC ${LIBEXIV2_PRIVATE_SRC} localtime.c)	
+    set(LIBEXIV2_PRIVATE_SRC ${LIBEXIV2_PRIVATE_SRC} localtime.c)
 endif()