Replace '#warning' directive with '#pragma message'

Replace '#warning' directive with '#pragma message'

If turn on '-Werror' option, '#warning' will be treated as an error,
which however cannot be suppressed even with "-Wno-error=cpp" option.

As a workaround, patch instead uses "#pragma message" which is information
only and is neither a warning nor an error.

Bug: http://web.sec.samsung.net/bugzilla/show_bug.cgi?id=15612

Reviewed by: sns.park

Change-Id: Icfbe90bcd9d9817307704189755d413a808fcc22
Signed-off-by: SeungSeop Park <sns.park@samsung.com>