Fix debuginfo generation

Fix debuginfo generation

There are two issues with apps/home/starter that are preventing
debuginfo from being generated:

- In the toplevel makefile, CMAKE_C_FLAGS does not include the '-g'
  flag, so debugging symbols are not added to the /usr/bin/starter
  binary. By using the %cmake macro in the spec file, the default CFLAGS
  from RPM (includes '-g') are exported to the build environment, and
  Cmake correctly uses these compiler flags during the build.

- In lock-setting/lockscreen-options/CMakeLists.txt, CMAKE_CXX_FLAGS is
  used, but the three library source files are C source, not C++. Thus,
  CMAKE_CXX_FLAGS is undefined by default and does not include CXXFLAGS
  from the environment. The solution is to use CMAKE_C_FLAGS instead,
  which picks up CFLAGS from the environment.

This commit fixes both issues.

Change-Id: Ibe96bf8a34aab05d3cf29c02b33e881cc9eddaf3
Signed-off-by: Patrick McCarty <patrick.mccarty@linux.intel.com>