Rename variables with reserved names

From the GNU libc manual[0]:

In addition to the names documented in this manual, reserved names
include all external identifiers (global functions and variables) that
begin with an underscore (‘_’) and all identifiers regardless of use
that begin with either two underscores or an underscore followed by a
capital letter are reserved names. This is so that the library and
header files can define functions, variables, and macros for internal
purposes without risk of conflict with names in user programs.

[0] https://www.gnu.org/software/libc/manual/html_node/Reserved-Names.html

Author: thyssentishman

common/include/pcl/impl/point_types.hpp

@@ -691,8 +691,8 @@ namespace pcl
     inline constexpr PointXYZLAB() : PointXYZLAB{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f} {}
 
     inline constexpr PointXYZLAB (float _x, float _y, float _z,
-                        float _L, float _a, float _b) :
-      _PointXYZLAB{ {{_x, _y, _z, 1.0f}}, {{_L, _a, _b}} } {}
+                        float _l, float _a, float _b) :
+      _PointXYZLAB{ {{_x, _y, _z, 1.0f}}, {{_l, _a, _b}} } {}
 
     friend std::ostream& operator << (std::ostream& os, const PointXYZLAB& p);
     PCL_MAKE_ALIGNED_OPERATOR_NEW