Bug 1261263 - Remove -fgnu89-inline. r=froydnj

It seems the reason why it was added back in bug 719659 is gone.

js/src/old-configure.in

@@ -733,14 +733,8 @@ dnl ========================================================
 dnl GNU specific defaults
 dnl ========================================================
 if test "$GNU_CC"; then
-    # Per bug 719659 comment 2, some of the headers on ancient build machines
-    # may require gnu89 inline semantics.  But otherwise, we use C99.
-    # But on OS X we just use C99 plus GNU extensions, in order to fix
-    # bug 917526.
+    # We use C99.
     CFLAGS="$CFLAGS -std=gnu99"
-    if test "${OS_ARCH}" != Darwin; then
-        CFLAGS="$CFLAGS -fgnu89-inline"
-    fi
     MKSHLIB='$(CXX) $(CXXFLAGS) $(DSO_PIC_CFLAGS) $(DSO_LDOPTS) -Wl,-h,$(DSO_SONAME) -o $@'
     MKCSHLIB='$(CC) $(CFLAGS) $(DSO_PIC_CFLAGS) $(DSO_LDOPTS) -Wl,-h,$(DSO_SONAME) -o $@'
     DSO_LDOPTS='-shared'

old-configure.in

@@ -928,14 +928,8 @@ if test "$GNU_CC"; then
     MMX_FLAGS="-mmmx"
     SSE_FLAGS="-msse"
     SSE2_FLAGS="-msse2"
-    # Per bug 719659 comment 2, some of the headers on ancient build machines
-    # may require gnu89 inline semantics.  But otherwise, we use C99.
-    # But on OS X we just use C99 plus GNU extensions, in order to fix
-    # bug 917526.
+    # We use C99.
     CFLAGS="$CFLAGS -std=gnu99"
-    if test "${OS_ARCH}" != Darwin; then
-        CFLAGS="$CFLAGS -fgnu89-inline"
-    fi
     # FIXME: Let us build with strict aliasing. bug 414641.
     CFLAGS="$CFLAGS -fno-strict-aliasing"
     MKSHLIB='$(CXX) $(CXXFLAGS) $(DSO_PIC_CFLAGS) $(DSO_LDOPTS) -Wl,-h,$(DSO_SONAME) -o $@'