Add option to disable documentation

Documentation is typically auto-detected by checking for php and
doxygen. Add an option to explicitly disable it.

Remove toggle keywords from libraries, examples, documentation and
unit tests. They were not consistent with the default status.

Change-Id: I21049675ccfd8e58ac612cd058641b197db5c0eb

diff --git a/configure b/configure
index dde215ff958a88d1734c05124fad01cfdcbae994..b3c5fe90d5597da5fe812d61650aebe3a5fe8159 100755 (executable)
--- a/configure
+++ b/configure
@@ -20,9 +20,10 @@ show_help(){
     show_help_pre
     cat << EOF
 Advanced options:
-  ${toggle_libs}                  don't build libraries
-  ${toggle_examples}              don't build examples
-  ${toggle_unit_tests}            build unit tests
+  ${toggle_libs}                  libraries
+  ${toggle_examples}              examples
+  ${toggle_docs}                  documentation
+  ${toggle_unit_tests}            unit tests
   --libc=PATH                     path to alternate libc
   --as={yasm|nasm|auto}           use specified assembler [auto, yasm preferred]
   --sdk-path=PATH                 path to root of sdk (iOS, android builds only)
@@ -293,6 +294,7 @@ CMDLINE_SELECT="
 
     libs
     examples
+    docs
     libc
     as
     fast_unaligned