[packages] libpng: update to 1.2.44, change InstallDev to install libpng*-config script in $(1) and a symlink in $(2), reformat

git-svn-id: svn://svn.openwrt.org/openwrt/packages@22160 3c298f89-4303-0410-b956-a3cf2f4a3e73

libs/libpng/patches/100-config_fix.patch

@@ -1,6 +1,6 @@
 --- a/scripts/libpng-config-body.in
 +++ b/scripts/libpng-config-body.in
-@@ -83,6 +83,7 @@
+@@ -83,6 +83,7 @@ while test $# -gt 0; do
  
      --static)
          R_opts=""
@@ -8,12 +8,3 @@
          ;;
  
      *)
---- a/scripts/libpng.pc.in
-+++ b/scripts/libpng.pc.in
-@@ -6,5 +6,5 @@
- Name: libpng
- Description: Loads and saves PNG files
- Version: 1.2.41
--Libs: -L${libdir} -lpng12
-+Libs: -lpng12
- Cflags: -I${includedir}