[epiphany] build: Get rid of more portability crap

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 8e362f7dd8ba18b4a318096e14d4f966eeb38cb9
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sat Nov 7 17:07:26 2015 -0600

    build: Get rid of more portability crap
    
    Seems exceptionally unlikely that anyone is relying on these.

 configure.ac |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index d135895..48fd895 100644
--- a/configure.ac
+++ b/configure.ac
@@ -134,10 +134,6 @@ AC_CHECK_FUNCS([mkdtemp])
 # for backtrace()
 AC_CHECK_HEADERS([execinfo.h])
 AC_SEARCH_LIBS([backtrace], [c execinfo])
-AC_C_INLINE
-AC_FUNC_MKTIME
-AC_FUNC_STRTOD
-AC_TYPE_SIZE_T
 
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