Fix some more build issues (#43)

We're now scrubbing environment variables in compile.com since gnu make
was not behaving as expected. It also appears there was a regression in
recent revisions that caused ASAN to be turned off for most binaries in
dbg mode, which has now been fixed. Cosmopolitan is fully ASAN hardened
down to the lowest level libraries and it doesn't need any interceptors

build/definitions.mk

@@ -46,11 +46,6 @@ V ?= 1
 LC_ALL = C
 SOURCE_DATE_EPOCH = 0
 
-DD ?= /bin/dd
-CP ?= /bin/cp -f
-RM ?= /bin/rm -f
-SED ?= /bin/sed
-MKDIR ?= /bin/mkdir -p
 TAGS ?= /usr/bin/ctags  # emacs source builds or something breaks it
 ARFLAGS = rcsD
 ZFLAGS ?=
@@ -83,41 +78,14 @@ PWD := $(shell pwd)
 IMAGE_BASE_VIRTUAL ?= 0x400000
 HELLO := $(shell build/hello)
 TMPDIR := $(shell build/findtmp)
-COMPILE := $(shell build/getcompile)
-CCVERSION := $(shell build/getccversion $(CC))
+COMPILE := $(shell build/getcompile) -V$(shell build/getccversion $(CC))
 
 export ADDR2LINE
-export CCVERSION
-export COMPILE
-export CP
-export DD
-export GZ
-export IMAGE_BASE_VIRTUAL
 export LC_ALL
-export LOGFMT
-export MKDIR
 export MODE
-export OBJDUMP
-export RM
-export SED
 export SOURCE_DATE_EPOCH
 export TMPDIR
 export V
-export ZFLAGS
-
-unexport COMPILER_PATH
-unexport CPATH
-unexport CPLUS_INCLUDE_PATH
-unexport C_INCLUDE_PATH
-unexport DEPENDENCIES_OUTPUT
-unexport GCC_COMPARE_DEBUG
-unexport GCC_EXEC_PREFIX
-unexport LANG
-unexport LC_CTYPE
-unexport LC_MESSAGES
-unexport LIBRARY_PATH
-unexport OBJC_INCLUDE_PATH
-unexport SUNPRO_DEPENDENCIES
 
 FTRACE =								\
 	-pg