Do not prepend -D in FLANN_DEFINITIONS in FindFLANN.cmake

[dooxe]

Corrected FLANN definitions that made an error when compiling pcl statically.

Hello,

When statically building a fresh-cloned PCL git repo, I get the following error:

[  5%] Building CXX object kdtree/CMakeFiles/pcl_kdtree.dir/src/kdtree_flann.cpp.o
In file included from <built-in>:417:
<command line>:1:9: error: macro name must be an identifier
#define -DFLANN_STATIC 1

It seems to be related to the FLANN definitions in cmake/FindFLANN.cmake file:

pcl/cmake/Modules/FindFLANN.cmake

Line 53 in dd90516

set(FLANN_DEFINITIONS ${FLANN_DEFINITIONS} "-DFLANN_STATIC")

The build is going well by removing -D

Maintainer Edit: closes #2904

[SergioRAgostinho]

Thank you @dooxe. 👍

[dooxe]

You're welcome 👍