package/libplatform: bump version

package/libplatform: bump version

Add -std=c++11 to CXXFLAGS to fix build with gcc < 5.x:

buildroot/output/build/libplatform-a7cd0d5780ed80a4e70480d1650749f29e8a1fb2/src/util/StringUtils.cpp:
 In static member function 'static std::string& StringUtils::TrimLeft(std::string&)':
buildroot/output/build/libplatform-a7cd0d5780ed80a4e70480d1650749f29e8a1fb2/src/util/StringUtils.cpp:456:99:
 warning: lambda expressions only available with -std=c++11 or -std=gnu++11 [enabled by default]
   str.erase(str.begin(), ::find_if(str.begin(), str.end(), [](char s) { return isspace_c(s) == 0; }));
                                                                                                   ^
buildroot/output/build/libplatform-a7cd0d5780ed80a4e70480d1650749f29e8a1fb2/src/util/StringUtils.cpp:456:100:
 error: no matching function for call to 'find_if(std::basic_string<char>::iterator, std::basic_string<char>::iterator,
  StringUtils::TrimLeft(std::string&)::__lambda0)'
   str.erase(str.begin(), ::find_if(str.begin(), str.end(), [](char s) { return isspace_c(s) == 0; }));
                                                                                                    ^

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>