grml.. back to the drawing board

Reverted
80f60ef540528ec5304b9fb9624a7ff1b077f108
cf1f87948bcf9b8edf8487fa7938a928cfed8f2f
as also MinGW bails out. Don't add yet more quirks, keep in mind the faulty
behavior and hope for the best until solved.

solenv/gbuild/platform/com_GCC_defs.mk

@@ -129,18 +129,7 @@ gb_COMPILEROPTFLAGS := $(gb_COMPILERDEFAULTOPTFLAGS)
 endif
 gb_COMPILERNOOPTFLAGS := -O0
 
-
-# At least with gcc 4.6.2 the situation was that if /usr/include was missing
-# from the -I... includes, header files were pulled from /usr/include/ instead
-# of solver/$INPATH/inc/external/
-# One should not add /usr/include, but ... have this as workaround now.
-# However, MacOSX would bail out with lots of deprecated methods as
-# /usr/include is not what's used on Mac.
-ifeq ($(OS_FOR_BUILD),MACOSX)
 gb_LinkTarget_INCLUDE := $(filter-out %/stl, $(subst -I. , ,$(SOLARINC)))
-else
-gb_LinkTarget_INCLUDE := $(filter-out %/stl, $(subst -I. , ,$(SOLARINC))) -I$(SYSBASE)/usr/include
-endif
 gb_LinkTarget_INCLUDE_STL := $(filter %/stl, $(subst -I. , ,$(SOLARINC)))