[libpng16] Bump version to 1.6.2rc03

configure.ac

@@ -18,7 +18,7 @@ AC_PREREQ([2.68])
 
 dnl Version number stuff here:
 
-AC_INIT([libpng],[1.6.2rc05],[png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng],[1.6.2rc03],[png-mng-implement@lists.sourceforge.net])
 AC_CONFIG_MACRO_DIR([scripts])
 
 # libpng does not follow GNU file name conventions (hence 'foreign')
@@ -39,7 +39,7 @@ dnl automake, so the following is not necessary (and is not defined anyway):
 dnl AM_PREREQ([1.11.2])
 dnl stop configure from automagically running automake
 
-PNGLIB_VERSION=1.6.2rc05
+PNGLIB_VERSION=1.6.2rc03
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=6
 PNGLIB_RELEASE=2
@@ -226,6 +226,11 @@ AC_ARG_WITH(libpng-prefix,
     fi])
 AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"])
 
+# Because GCC by default assembles code with an executable stack, even though it
+# compiles C code with a non-executable stack, it is necessary to do a fixup
+# here (this may by GCC specific)
+AC_SUBST([AM_CCASFLAGS], [-Wa,--noexecstack])
+
 AC_ARG_ENABLE([arm-neon],
    AS_HELP_STRING([[[--enable-arm-neon]]],
       [Enable ARM NEON optimizations: =off, check, api, on:]
@@ -234,12 +239,9 @@ AC_ARG_ENABLE([arm-neon],
       [a call to png_set_option; on: turn on unconditionally.  The]
       [default is 'on' if __ARM_NEON__ is defined, otherwise 'off'.]),
    [case "$enableval" in
-      no|off)
-         # disable the default enabling on __ARM_NEON__ systems:
+      off)
          AC_DEFINE([PNG_NO_ARM_NEON], [],
-                   [Disable ARM Neon optimizations])
-         # Prevent use of the assembler files below:
-         enable_arm_neon=no;;
+                   [Disable ARM Neon optimizations]);;
       check)
          AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
                    [Check for ARM Neon support at run-time]);;