Don't quote compiler flags to avoid separation with ; characters.
Don't quote compiler flags to avoid separation with ; characters.

Fixes build failure:
```
make[3]: Entering directory '/tmp/buildd/libkml-1.3.0~r864+git20150723-0fa2f22/obj-x86_64-linux-gnu'
/usr/bin/cmake -E cmake_progress_report "/tmp/buildd/libkml-1.3.0~r864+git20150723-0fa2f22/obj-x86_64-linux-gnu/CMakeFiles"
[  0%] Building CXX object src/kml/base/CMakeFiles/kmlbase.dir/time_util.cc.o
cd "/tmp/buildd/libkml-1.3.0~r864+git20150723-0fa2f22/obj-x86_64-linux-gnu/src/kml/base" && /usr/bin/c++   -Dkmlbase_EXPORTS -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 ;-Wall -Wextra -Wno-unused-parameter -pedantic -fno-rtti -fPIC -I/usr/include/minizip -I/usr/include/uriparser -I"/tmp/buildd/libkml-1.3.0~r864+git20150723-0fa2f22/src"    -o CMakeFiles/kmlbase.dir/time_util.cc.o -c "/tmp/buildd/libkml-1.3.0~r864+git20150723-0fa2f22/src/kml/base/time_util.cc"
c++: fatal error: no input files
compilation terminated.
/bin/sh: 1: -Wall: not found
src/kml/base/CMakeFiles/kmlbase.dir/build.make:57: recipe for target 'src/kml/base/CMakeFiles/kmlbase.dir/time_util.cc.o' failed
make[3]: *** [src/kml/base/CMakeFiles/kmlbase.dir/time_util.cc.o] Error 127
```

libkml/libkml,libkml/libkml,sebastic/libkml,sebastic/libkml,sebastic/libkml,sebastic/libkml,rashadkm/libkml,sebastic/libkml,rashadkm/libkml,sebastic/libkml,sebastic/libkml,libkml/libkml,rashadkm/libkml,libkml/libkml,libkml/libkml,rashadkm/libkml,rashadkm/libkml,sebastic/libkml