.gitignore: Only ignore generated cmake_install.cmake files, not *.cmake
.gitignore: Only ignore generated cmake_install.cmake files, not *.cmake

waffle contains many *.cmake files, and will potentially have more added
in the future; .gitignore should not ignore these files.  Narrow the
ignore pattern from *.cmake to just the generated file
cmake_install.cmake.

Signed-off-by: Josh Triplett <c028c213ed5efcf30c3f4fc7361dbde0c893c5b7@joshtriplett.org>
Signed-off-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

dcbaker/waffle,chadversary/waffle,waffle-gl/waffle,chadversary/waffle,evelikov/waffle,janesma/waffle,chadversary/waffle,fjhenigman/waffle,maurossi/waffle,yinquan529/waffle-gl-waffle,maurossi/waffle,yinquan529/waffle-gl-waffle,evelikov/waffle,evelikov/waffle,dcbaker/waffle,waffle-gl/waffle,dcbaker/waffle,maurossi/waffle,fjhenigman/waffle,waffle-gl/waffle,yinquan529/waffle-gl-waffle,fjhenigman/waffle,janesma/waffle,janesma/waffle,waffle-gl/waffle