No need to check for dependencies

Suggested in #7857 (comment)

Author: Andras Fekete

doc/generate_documentation.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+# This script depends on g++, cmake, git, and make to be installed
 
 POSIXLY_CORRECT=1
 
@@ -8,30 +9,6 @@ GEN_PDF=false
 GEN_ALL=false
 INSTALL_DOX=false
 
-command -v g++
-if [ $? -ne "0" ]; then
-echo "Please install g++"
-exit 1
-fi
-
-command -v cmake
-if [ $? -ne "0" ]; then
-echo "Please install cmake"
-exit 1
-fi
-
-command -v git
-if [ $? -ne "0" ]; then
-echo "Please install git"
-exit 1
-fi
-
-command -v make
-if [ $? -ne "0" ]; then
-echo "Please install make"
-exit 1
-fi
-
 # Checking arguments and setting appropriate option variables
 
 for var in "$@"